5.A

由so we only had time for a few words可知：当我们到访时，Dr. Smith. 正要离开，was leaving过去进行时表将来。故选A。

4.C

由语义环境可知，“未告诉”这一动作发生在“未参加会议”这一过去时间之前，排除B.D两项；about为介词，后应用-ing形式。故选C

3.B

hide动作发生在caught之前，故用过去完成时。B项为最佳答案。

2.A

When I telephoned you 是一个明确的过去时间点，表示那时正在发生的动作应用过去进行时。

1. B

本题考查在具体语言环境下使用基本时态的能力。“不知道”是发生在说话之前的事情，所以我们要用瞬间过去时。

30. I don’t understand how you got a ticket. I always _____ you _____ a careful driver.

　 A．think;are　　　 B. am thinking, are　　 　C. thought, were　　　　 D. think, were

[答案与解析]

29. US president George Bush ____ the war in Iraq on March 20,2003. But internationally, the US war in Iraq _____ as one country misusing its power over a weaker nation.

　 A．started, has been criticized　　　 　　　　　B. has started, had been criticized

　 C．started, has criticized　　　　　　　　　　 D. had started, was criticized

28. The article suggests that when a person 　　　　　　under unusual stress he should be especially careful to have a well-balanced diet.

　 A．be　　　　　　　　　　　　 B．is　　　　　　　　　　　　 C．were　　　　　　　　　 D．was

27. I can guess you were in a hurry. You 　　　your sweater inside out .

A．had worn　　　　　　　 B．are wearing　　　　 C．were having on　　 D．were dressing

26.-Don’t you feel surprised to see Bruce at the meeting ?

　　 -No. I really didn’t think 　　　　　here .

　 A．he has been 　　　　 B．he had been 　　　 C．he would be 　　　 D．he would have