单项选择题

（）we leave now, we can’t avoid traffic

A. If
B. Unless
C. Even though
D. No matter

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单项选择题

We can start this project （）the manager allows it

A. once
B. though
C. unless
D. while

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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