单项选择题

He demanded that we explain what was happening,

A．hadn't we
B．didn't we
C．hadn't he
D．didn't he
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单项选择题
There are, more than fifty proposals______ at the conference.
A．discussing
B．having been discussed
C．discussed
D．to be discussed
单项选择题
In many American families, parents feel that children should make important decisions ______.
A．to themselves
B．on themselves
C．by themselves
D．of themselves
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