单项选择题

Hardly ______ when the door suddenly closed.

A．they had arrived
B．they arrived
C．did they arrive
D．had they arrived
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单项选择题
That young boy was knocked ______ by a passing car.
A．on
B．at
C．in
D．down
单项选择题
______ I like about her is her diligence.
A．That
B．How
C．What
D．Which
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