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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单项选择题
The president（）Mr. Baker medical adviser.

A. promised
B. praised
C. imagined
D. appointed
单项选择题
Could you hold on a few minutes （）I check this with my boss

A. for
B. since
C. during
D. while
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