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
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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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