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 非谓语动词题。speaker作hear的逻辑宾语,所以用不定式的被动语态形式。D不是正确的表达方法。
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