Which of the following sentences expresses a passive meaning?

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问题 Which of the following sentences expresses a passive meaning?

选项 A、Bell invented the telephone in 1876.
B、The theory of relativity is hard to explain.
C、I’m sorry to have given you so much trouble.
D、I asked Professor Xu how to learn English well.

答案B

解析 当不定式作表语形容词(或宾补)的状语,又与句中的主语(或宾语)有逻辑上的动宾关系时,常用主动形式表被动意义,如:We found the subject hard to understand.(不定式to understand修饰hard,与句中宾语the subject有逻辑上的动宾关系。)四个选项中只有B属于此用法,相当于hard to be explained。其他选项均为主动意义。
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