Could I take the book out of the library, Mr, Wang ?No, （）you pay 50Yuan first.A, if B, unless C, because D, although
问题描述：
Could I take the book out of the library, Mr, Wang ?No, （）you pay 50Yuan first.A, if B, unless C, because D, although
答
B
从语境看是得先交50元钱才能把书带出图书馆,所以用unless,“ 除非”
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