单项选择题

Every possible means（）tried, but we can not open the door.

A．are
B．are being
C．were
D．has been

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单项选择题
You（）the dictionary to Tom yesterday, he needed them awfully.

A．must return
B．should have returned
C．ought to return
D．can have returned
单项选择题
A number of new buildings（）set up in Wuhan in the past few years.

A．have
B．has been
C．have been
D．was
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