单项选择题

They happened to （）for Tianjin when we got there.

A. leave
B. have left
C. leaving
D. had left

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Before the sales start, I make a list of （） my kids will need for the coming season.

A. why
B. what
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Sam （）some knowledge of the computer just by watching others working on it.

A. brought up
B. looked up
C. picked up
D. set up

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