It's difficult your sound because the noise is too high. [ ]A. to listen B. to know C. to learn D. to hear 题目和参考答案——青夏教育精英家教网——

题目内容

It's difficult _____ your sound because the noise is too high.

[ ]

A. to listen　
B. to know　
C. to learn
D. to hear

D

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