问题

I’m sorry you’ve been waiting so long，but it’ll still be some time ________ Brian gets back

A:in which
B:on which
C:atwhich
D:to which

正确答案是：

同类题型

You’ll surly make progress _______ you work with a strong will

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Two ___________ died in the fire.

With all the magazines I needed _____, I left the post office [ ]