单项选择题

() the work was very difficult, they managed to finish it in time.

A. Because
B. Though
C. Therefore
D. But

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单项选择题

When Mary finally got there, Tom had left an hour ()

A. before
B. ago
C. later
D. after

单项选择题

I don’t think she is right, so her words of advice were () on me.

A. wasted
B. useful
C. helpful
D. effective

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