单项选择题

There was no need to wait for a table. They ______ reservations for us.

A．should have made
B．must have made
C．should make
D．have made
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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
单项选择题
On the ______, people were asked which kind of shampoo they preferred.
A．investigation
B．diagram
C．search
D．survey
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