问题描述：
The last time I went to hainan was in March, _____the weather was beautiful.
A.while B. which C. When D. That .为什么是when. 介词加一个which可变成when.这里哪里有介词啊?
A.while B. which C. When D. That .为什么是when. 介词加一个which可变成when.这里哪里有介词啊?
问题解答：
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