单项选择题

Not till he got home ______ that he had lost his keys.

A．he realized
B．did he realize
C． realized he
D．he did realize
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单项选择题
Like the old, __ respected in our country.
A．the female are
B．the female is
C．a female is
D． female is
单项选择题
It was very reluctantly ______ she agreed to help.
A．for
B．what
C．that
D． to
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