单项选择题

The letters PTO ______ parent-teacher organization.

A．stand for
B．call for
C．head for
D．care for
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The president ______ Mr. Baker medical adviser.
A．promised
B．praised
C．imagined
D．appointed
单项选择题
He ______ a great deal in the old days.
A．was suffered
B．had been suffered
C．suffered
D．had suffered
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