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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单项选择题
Excuse me, do you know when ______ your boss
A．can I see
B．do I see
C．I see
D．will see
单项选择题
Every corner of the room ______ by this Friday.
A．should have painted
B．will have been painted
C．is painting
D．will paint
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