题目内容
12．They _________ play football last Friday because Simon forgot to bring his football here．（ ）| A． | could | B． | couldn't | C． | can't | D． | can |
分析 上周五他们不可能踢足球了，因为西蒙忘记带他的足球了．
解答 答案：B．根据Simon forgot to bring his football here，可知西蒙忘记带他的足球了，所以他们不可能踢足球了，在这里应该用否定句．couldn't 是could的否定式．表推测时，它们并不是过去式，只是在语气上比can或can't委婉；could和couldn't 表示推测时，可用于肯定句、否定句和疑问句．could/couldn′t一般用于过去的时态，can/can′t一般用于一般现在时态．故选B．
点评 本题考查了情态动词的用法．解答时理解句意以及所给选项的意思并作出正确选择．
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