The ability ______ is very important for any speaker.

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问题 The ability ______ is very important for any speaker.

选项 A、to hear clearly
B、to be clearly heard
C、to hearing clearly
D、to being clearly heard

答案B

解析 本题测试非谓语动词的用法。动词不定式的被动式做定语修饰“the ability”。
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