35.[2010·上海市徐汇区高三二模] He _______ the letter typed, but he decided to handwrite it and send it in person in order to show his sincerity.

A. must have had　　　　　　 B. should have had　

C. would have　　　　　　　　　　　　　　　　　　　　　　　 D. could have had

35D考查虚拟语气。此处He could have had the letter typed意为：他本能把那封信打印出来的。

34.[2010·上海市卢湾区高三二模] So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .

A. mustn’t be 　　　　　　　　　 B. may not be

C. can’t be 　　　　　　　　　　　　　　　　　　 D. won’t be

34C考查情态动词表推测。句意：到目前为止，科学家们在地球以外的星球没有发现任何生命，可是，正在一些科学家在外层空间积极探查生物的时候，另一些科学家认为外层空间不可能存在生命。此处can表推测常用于否定句。

33. [2010·拉萨中学6次月考]The weather turned out to be fine yesterday, I ________ the trouble to carry my umbrella with me.

A. should have taken　　　　 B. could have taken

C. needn’t have taken　　　　 D. mustn’t have taken

33C考查虚拟语气。句意：我们没有必要找麻烦带伞。此处needn’t have taken表示“没有必要做的事做了”。

32. A. 此题考查情态动词的用法. could 表示”可能性”

32. [2010·长沙雅礼中学9次月考]About one in ten computer game players show signs of addictive behavior that 　　　have negative effects on their family, friends and school work , according to a new study.

　　　 A． could　　 　　 B．should　　　　 　 C．need　　　　　　　　　　　　 D．would

31．[2010·全国大联考(新课标)]- It _______ be Mr．Johnson who is in the office．

- No, it _______ be him．I saw him off at the airport half an hour ago．

　　　　 A．can’t ; can’t　　　 B．must; can’t　　　　 C．must; mustn’t　 D．may; mustn’t

31B考查must表推测的用法。must只能用于肯定句；在否定句和疑问句中用can。

30. [2010·河北唐山市三模] KidZania is an indoor park that lets children try out the professions

they　　　 choose in the future.

A. must　 B. should　 C. might　 D. can

30C考查情态动词的用法。句意：KidZania是一个室内公园，这个公园让孩子们尝试他们未来可能选择的职责。根据句意选C。

29．[2010·北京西城二模]If transport costs　　　 　into consideration at the beginning , the factory would have been built far from its present place.

　　　　 A．will be taken 　　　　 B．were taken　　　　　　 C．had been taken　　　 D．were being taken

29C考查虚拟语气及短语的含义。根据从句与过去的事实相反可知用过去完成时。

28．[2010·河北唐山市二模]It is usually not quite cold in this area in March，but sometimes temperature_____be low．

　 A．should　 B．must　　 C．can　 D．shall

28C 考查情态动词的用法。此处can在肯定句中表推测，表示理论上的可能性。句意：有时温度可能会低。

27. [2010·河南开封三模]You spent 300 yuan on a pair of cotton gloves. Such a pair of cotton gloves______be worth so much.

A. mustn't　　　　 B. wouldn't　　　　　 C. can't　　　　　 D. needn't

27C考查情态动词的用法。Can表推测用于否定句，故选C。句意：一副这样的手套不可能值这么多钱。