单项选择题

He's working hard for fear that he ______.

A．should fall behind
B．fell behind
C．may fall behind
D．would fallen behind
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单项选择题
E-mail, as well as telephones, ______ an important part in daily communication.
A．is playing
B．have played
C．are playing
D．play
单项选择题
Hardly ______ the railway station when the train started．
A．did I reach
B．had I reached
C．I reached
D．I had reached
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