单项选择题

The lecture was just getting to the heart of the matter （）the class period ended.

A. before
B. until
C. after
D. when

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单项选择题
You （）your letters yourself. I would have posted them if you had asked me.

A. didn't need to post
B. don't have to post
C. needn't have posted
D. had posted
单项选择题
George's daughter tried in vain to talk him （）accusing his neighbor.

A. round
B. over
C. into
D. of
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