单项选择题

You should have blended the butter with the sugar thoroughly.

A．spread
B．mixed
C．beaten
D．covered
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单项选择题
Customers often defer payment for as long as possible.
A．make
B．demand
C．postpone
D．obtain
单项选择题
She was a puzzle.
A．girl
B．woman
C．problem
D．mystery
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