单项选择题

______ he will finish his work early enough to go to the party is still uncertain.

A．For
B．Whether
C．Then
D．When
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单项选择题
On the ______, people were asked which kind of shampoo they preferred.
A．investigation
B．diagram
C．search
D．survey
单项选择题
By the time they ______ enough money for a down payment on a house, prices ______considerably.
A．had saved; rose
B．saved; were risen
C．had saved; had risen
D．had saved; were rising
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