单项选择题

I’m very grateful to you for what you’ve given me and () you have done for me.

A. which
B. that
C. all what
D. all that

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单项选择题
John and I () friends for eight years. We first got to know each other at a Christmas party. But we () each other a couple of times before that.

A. had been; have seen
B. have been; have seen
C. had been; had seen
D. have been; had seen
单项选择题
() experiments on the laboratory, it started to rain heavily.

A. While performing
B. Performing
C. While I was performing
D. To perform
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