问题描述:
I found it hard to concentrate on my work ( )so many people around
A because B with C when D by
为什么选B 而不选A C D 请分别解释原因
A because B with C when D by
为什么选B 而不选A C D 请分别解释原因
问题解答:
我来补答展开全文阅读