单项选择题

If we hadn't had your help, we（）the project so easily.

A、 would not finish
B、 could not have finished
C、 can not finish
D、 will not finish

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（）the lights in Tom's room were out, Mary thought he was not at home.

A、 Seeing
B、 Saw
C、 Having seen
D、 Have seen
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Perhaps this is the only way（）you can learn a foreign language well.

A、 that
B、 where
C、 which
D、 how
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