单项选择题

Tom（）along the street when he ran into an old friend who used to help him with his studies.

A. was walking
B. had walked
C. would walk
D. walked

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—Xiao Zhang, I can’t play ping-pong at all. I wonder if you could teach me.—（）Just name the day.

A. Let me see
B. Go ahead
C. As you like it
D. With pleasure
单项选择题
I was under the impression that he was a very slow boy（）he succeeded in writing a big book.

A. when
B. after
C. as
D. until
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