问题描述：
You have been reading to me ____ James went out. You must be very tired now.
A. when B. while C. as D. ever since为什么选B?
ever since 为什么不可以呢?谢谢帮助!
A. when B. while C. as D. ever since为什么选B?
ever since 为什么不可以呢?谢谢帮助!
问题解答：
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