单项选择题

How to raise the efficiency, ______ is the question.

A．what
B．which
C．that
D．if
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单项选择题
The thief ______ the lock of the lady's jewelry case open.
A．hit
B．forced
C．stole
D．broke
单项选择题
Helen said she would like to go to Atlanta by air, but I wonder if she has enough money to pay for the
A．travel
B．tourism
C．journey
D．course
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