It was recommended that passengers ______ smoke during the flight.
A、
not
B、
need not
C、
could not
D、
would not
【正确答案】
A
【答案解析】
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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