It's difficult _____ your sound because the noise is too high. [ ]A. to listen B. to know C. to

题目简介

It's difficult _____ your sound because the noise is too high. [ ]A. to listen B. to know C. to

题目详情

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

[     ]

A. to listen 
B. to know 
C. to learn
D. to hear
题型:单选题难度:中档来源:专项题

答案

D

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