单项选择题

There must be a(n) ______ window somewhere--I can feel cold air coming in.

A．open
B．opened
C．opening
D．open-up
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单项选择题
Tom and Jack have returned but ______ students of the group haven't come back yet.
A．other
B．the others
C．others
D．another
单项选择题
Not until a monkey is several years old ______ to exhibit signs of independence from its mother.
A．it begins
B．does it begin
C．and begin
D．beginning
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