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
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______ you know the basics, let me show you some more advanced functions.
A. Now that



B. So that
C. For
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单项选择题
We thank you very much for your UC and shipping instructions ______ your trial order.
A. being covered



B. to be covered
C. covering



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