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问题: 语法问题

When you call on a Frenchman, you may chat for an hour or so,_____ not even a coffee or water is offered.
A. during this time
B. during which time
请简述理由

解答:

选B.
during which time 在这里是用介词during 加关系代词which 引导的一个定语从句。which用来修饰限定后面的名词 time 。time指代的是谈话的一个多小时期间。