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  3. His ears are highly sensitive ______ any unusual sound in the machine．

His ears are highly sensitive ______ any unusual sound in the machine．

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问题  His ears are highly sensitive ______ any unusual sound in the machine．
选项 A、of
B、on
C、to
D、by
答案C
解析 此题考查习惯用法。首先读懂全句，注意句中的sensitive。联想到sensitive的习惯用：sensitive+to+名词，选C为答案。
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