单项选择题

The tree was cut ______.

A．down
B．B ) in
C．off
D．ont
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单项选择题
The idea ______ good, but I'm afraid it is impractical.
A．hears
B．sounds
C．looks
D．feels
单项选择题
Do you believe ______ smoking can cause lung cancer
A．if
B．that
C．when
D．what
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