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求英语达人解答几个单选

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求英语达人解答几个单选
1. The schedule, originally ____ out last week, had to be cancelled because of the unexpected snow storm.
A. carried B. to be carried C. being carried D. was carried
2.--May I tell this to my close friend?
--No, you ____. Never let anybody else know.
A.needn't B.shouldn't C.mustn't D.can't
3.—Why is your professor so happy recently?
—Because the theory she insisted on__________correct.
A.is proved B.proving C.was proved D.has proved
分别选什么 为什么 谢谢~~
1.B 行程本来上周要进行,可是因为暴风雪没进行,所以表示将要,用不定式.
2.C 这题是说你一定不能把这个告诉朋友,表禁止.选C
3.D prove不用被动