为什么这里要用which?
As soon as he saw us, he picked up a long pipe which was covered with coins and opened one of the baskets. 总是搞不清楚这里的介词应该用what ,that，who还是其他的． help啊．．．．
As soon as he saw us, he picked up a long pipe which was covered with coins and opened one of the baskets which引导的是定语从句.前面的pipe指的是物,因此用which或that,但是如果是非限制性定语从句,简单点说pipe后有逗号,应该用which
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