Old people ______ carefully.A、must be listenedB、must be listened toC、must list

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问题 Old people ______ carefully.

选项 A、must be listened
B、must be listened to
C、must listen to

答案 B

解析此题考查被动语态。情态动词的被动语态结构为be后接过去分词。此处listen为不及物动词，后接宾语必须有介词to，而old people为其宾语。

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