单项选择题

It could have saved me some trouble （） about it.

A．had I known
B．I had known
C．did I know
D．I knew

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

A．hand in
B．to hand in
C．handing in
D．having handed
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