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1 . The young technician made one rookie mistake after another in the competition, which suggests that he ________ have followed his master’s instructions.
A.can’t | B.needn’t | C.mustn’t | D.shouldn’t |
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21-22高二上·全国·假期作业
2 . I ________ have finished the report without your timely help. Thank you so much!
A.could | B.couldn’t | C.must | D.mustn’t |
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