单项选择题

I do not remember ________________ this book before.

A．reading
B．having ever read
C．to have ever read
D．to read
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单项选择题
Butter is cheap when it is plentiful, and ___________ when it is in shortage.
A．costly
B．expensive
C．dear
D．priceless
单项选择题
How long ______________ in the sun You are working too hard!
A．have you sewn
B．did you sew
C．have you been sewing
D．are you sewing
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