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
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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