单项选择题

The current general slackness of the market has prevented us from ______ new orders with you.

A．placing
B．putting
C．arranging
D．providing
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单项选择题
The back garden of our house contains a lawn, ______ very pleasant to sit on in summer.
A．which is
B．which it is
C．it is
D．where it is
单项选择题
John's score on the test is the highest in the Class; he ______ last night.
A．must study
B．should have studied
C．must have studied
D．is sure to study
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