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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