单项选择题

Smoking is a ______ cause of lung cancer.

A．major
B．great
C．important
D．large
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单项选择题
So______ after she learned the good news that she could hardly fall asleep that night.
A．excited the mother was
B．the mother was excited
C．was the mother excited
D．excited was the mother
单项选择题
The conference ______ in Beijing next week is bound to be a great success.
A．holding
B．being held
C．to hold
D．to be held
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