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【题目】They ________ stand at the gate and welcome the guests because the robots can do that.

A.mustn’tB.shouldn’tC.needn’tD.can’t

【答案】C

【解析】

句意:他们不必站在门口欢迎客人,因为机器人能做到。
考查情态动词否定式的用法。A. mustn’t禁止,不准;B. shouldn’t不应该;B. needn’t不必;D. can’t不可能。结合语境“因为机器人能做到,所以没有必要站在门口欢迎客人”。故选C

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