单选题
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】
与recommend相关的名词性从句中要使用虚拟语气,从句中使用“should+动词原形”,should可以省略。
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