单项选择题

Not until ______ his shoes did he enter one of the low -ceilinged rooms of the Japanese house.

A．did he remove
B．he had removed
C．had he removed
D．he removed
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单项选择题
The little girl needs ______ after her shock.
A．being comforted
B．be comforted
C．comforting
D．comforted
单项选择题
______ what to do, he went to the old man for help.
A．Not knowing
B．Not know
C．Not to know
D．Not known
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