单项选择题

Up to now not only the students but also their teacher _________the football club.

A．joined
B．has joined
C．have joined
D．joins
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单项选择题
There are some more topics to discuss, _________the problem of pollution.
A．generally
B．especially
C．exactly
D．probably
单项选择题
I was angry when I knew my favorite apple tree_________.
A．cutting down
B．cutted down
C．being cut down
D．to be cut down
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