It was recommended that passengers _______ smoke during the flight.

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问题 It was recommended that passengers _______ smoke during the flight.

选项 A、not
B、need not
C、could not
D、would not

答案A

解析 It is recommended that．．．表明that从句需要使用虚拟语气，其形式为“should+动词原形”。其中should可以省略，故答案为A。

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专业英语四级

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