单项选择题

A baby might show fear to an unfamiliar adult, _____ he is likely to smile and reach out to another infant.

A．if
B．whenever
C．whereas
D．because
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单项选择题
He is not under arrest, _____ any restriction on him.
A．or the police have placed
B．or have the police placed
C．nor the police have placed
D．nor have the police placed
单项选择题
Many foreign students come to study in the U.S., some _____ by scholarships,others by the U.S. government‘s Agency for International Development, by the Ford Foundation, and so on.
A．to be supported
B．being supported
C．are supported
D．having been supported
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