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 本题考查不定式作定语的用法。首先可以排除C和D。然后分析speaker和hear之间的关系是被动关系,因此B正确。
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