单项选择题

It was in the winter of 1951 （） a heavy fog moved into London.

A. that
B. then
C. when
D. /

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Your sister used to visit you quite often, （）

A. isn't she
B. use not she
C. wasn't she
D. didn't she

单项选择题

I didn't attend the conference, but I wish I （）there.

A. had been
B. be
C. were
D. would be

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