单项选择题

The number of orders went up ______ we increased our prices by 15%.

A. because



B. although
C. when
D. if
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单项选择题
I would have helped you, but I ______ you were in trouble.
A. didn't know



B. haven't known
C. hadn't known



D. knew
单项选择题
______ you know the basics, let me show you some more advanced functions.
A. Now that



B. So that
C. For
D. Because
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