单项选择题

On ______ side of the street were standing young boys and girls to welcome the President.

A．both
B．two
C．either
D．every
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单项选择题
Hospital doctors don t go out very often as their work ______ all their time.
A．takes away
B．takes in
C．takes over
D．takes up
单项选择题
The letters PTA ______ parent-teacher association.
A．stand for
B．call for
C．reach for
D．care for
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