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 该题考查非真实条件从句中的虚拟语气的用法。在句型It is(was) recommended that…中,从句用虚拟语气,谓语动词形式为“should+动词原形”,其中should可以省略。  
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