单项选择题

(White and black) light, (if mixing) (in) the right proportion, (will show) us grey.

A．White and black
B．if mixing
C．in
D．will show
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单项选择题
The truck turned just (in time) and narrowly missed (to be struck) by the immense mountain which (rose over) 50 feet (out of) turning beside her.
A．in time
B．to be struck
C．rose over
D．out of
单项选择题
The (anti-smoking) campaign (on campus) has made (quite an impact) (with) the students.
A．anti-smoking
B．on campus
C．quite an impact
D．with
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