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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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
A．respectivelyB．eachC．allD．more
A．respectively
B．each
C．all
D．more
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