单项选择题

It seems oil () from this pipe for some time. We’ll have to take the machine apart to put it right.

A. had leaked
B. is leaking
C. leaked
D.has been leaking

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单项选择题
They saw a new movie at the theatre, () they had dinner at a Chinese restaurant.

A. then which
B. which after
C. after which
D. after that
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