It is difficult for a (speak) ______ to speak loudly enough without a microphone.

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问题 It is difficult for a (speak) ______ to speak loudly enough without a microphone.

选项

答案speaker

解析 for sb to do sth是动词不定式的复合结构，speak是动词，应该变成名词speaker。

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大学英语三级B级

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