Question

--- Where's that report?

--- I brought it to you ________ you were in Mr. Black's of-fice yesterday.

1. A.
   if
2. B.
   when
3. C.
   because
4. D.
   before

Answer 1

B
句意："那篇报告在哪儿呢？""昨天当你在布莱克先生办公室的时候我带给你了"。when"当……时候"。