单项选择题

This is the place ______ I used to camp when I was younger.

A．what
B．when
C．where
D．which
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单项选择题
The teacher should explain the lesson, ______
A．shouldn't he
B．should he
C．doesn't he
D．does he
单项选择题
—I was pleased to hear the news. --So ______.
A．do I
B．am I
C．was I
D．did I
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