单项选择题

Hardly （） the room when I found a letter on the floor.

A．I had entered
B．had I entered
C．I entered
D．did I enter

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单项选择题
He kept postponing （） his assignments.

A．hand in
B．to hand in
C．handing in
D．having handed
单项选择题
Fifty dollars （） a big sum of money for a child.

A．are
B．is
C．being
D．having been
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