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
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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
单项选择题
My father had to be __________ with this small success.
A．satisfied
B．satisfactory
C．pleased
D．content
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