单项选择题

I will be able to help you （）I finish my work

A. as
B. because
C. while
D. once

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单项选择题

Since （）to Canada, Joyce has taken up snowboarding

A. to move
B. have move
C. moving
D. moved

单项选择题

（）my own car, I asked Jim to give me a ride

A. Having
B. Had
C. Not having
D. I not having

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