单项选择题

Scarcely ______ asleep when a knock at the door awakened me.

A．had I fallen
B．I had fallen
C．fell I
D．I fell
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单项选择题
— Excuse me, could you please have my computer ______ — Of course.
A．repair
B．repairing
C．repaired
D．be repaired
单项选择题
______ a reply, he decided to write again.
A．Not receiving
B．Receiving not
C．Not having received
D．Having not received
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