单项选择题

More than one question ______ asked.

A．was
B．be
C．were
D．been
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单项选择题
The tree was cut ______. A) down B ) in C) off D) ont
The tree was cut ______. A) down B ) in C) off D) ont
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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