4.(2011·江西)It ________ be the postman at the door. It's only six o'clock.
A. mustn't
B. can't
C. won't
D. needn't
[解析]句意:门外不可能是邮递员。现在才六点。A:不可以,禁止;B:不可能;C:不愿意;D:不必。根据句意可知答案为B项。
[答案]B
5.(2011·陕西)I ________ through that bitter period without your generous help.
A. couldn't have gone
B. didn't go
C. wouldn't go
D. hadn't gone
[解析]句意:如果没有你的慷慨相助的话,我不可能熬过那段艰苦的日子。本题考查虚拟语气。without your generous help 相当于含蓄条件句If it hadn't been your generous help,此处表示与过去事实相反,所以主句部分采用 couldn't have done 结构,表示“本不可能”,故选择A项。
[答案]A
6.(2011·陕西)—Will you read me a story, Mummy?
—OK. You ________ have one if you go to bed as soon as possible.
A. might
B. must
C. could
D. shall
[解析]句意:——妈妈,给我讲个故事好吗?——好,如果你尽快上床睡觉,我就给你讲一个。shall 在此处表示“允诺”,故选择D项。
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