单项选择题

Neither he nor ______ ever been to the United States.

A．have I
B．I have
C．am I
D．I am
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单项选择题
Thoroughly confused, the investigator hesitated to report ______.
A．what did he see
B．what he had seen
C．what had he seen
D．what he was seen
单项选择题
Indiana University ______ an eight-campus network.
A．is composed of
B．makes up
C．constitutes
D．consists
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