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
单项选择题
To improve the quality of our products, we asked for suggestions ______ had used the products.
A．whoever
B．who
C．whichever
D．which
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