单项选择题
The police still haven' t found her, but they' re doing all they ______ .
A.may
B.can
C.must
D.will
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单项选择题
It is reported that many a new house ______ at present in the disaster area.
A.are being built
B.were being built
C.was being built
D.is being built
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单项选择题
John opened the door. There ______ he had never seen before.
A.a girl did stand
B.a girl stood
C.did a girl stand
D.stood a girl
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