单项选择题

Current data suggest that although ______ states between fear and aggression exist, fear and aggression are as distinct physiologically as they are psychologically.

A. simultaneous
B. serious
C. partial
D. transitional
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单项选择题
The government requires that a census be taken every five years so that accurate statistics may be ______ .
A. composed
B. complemented
C. completed
D. compiled
单项选择题
He promised me a letter; he ought to ______ it days ago.
A. have written
B. write

C. had written
D. be writing
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