His ears are highly sensitive _______ any unusual sound in the machine.
A
of
B
on
C
to
D
by
出自：辽宁科技学院大学英语(三)(专升本)
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His ears are highly sensitive _______ any unusual sound in the machine.
A
of
B
on
C
to
D
by
出自：辽宁科技学院大学英语(三)(专升本)