单项选择题

Achieving a high degree of proficiency in English as a foreign language is not a mysterious______without scientific basic.

A．process
B．practice
C．procedure
D．program
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单项选择题
There is a real possibility that these animals could be frightened, ______ a sudden loud noise.
A．being there
B．should there be
C．there was
D．there having been
单项选择题
The policemen went into action______when they heard the alarm.
A．promptly
B．presently
C．quickly
D．directly
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