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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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
He made up his ______ to study hard.
A．brain
B．head
C．thought
D．mind
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