题目内容
3. It's important___________ polite when__________ to old people.
A. be; talking B. to be; talking
C. being; to talk D. to be; to talk
B
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题目内容
3. It's important___________ polite when__________ to old people.
A. be; talking B. to be; talking
C. being; to talk D. to be; to talk
B