单项选择题

The two students （） for two hours, I wonder what they are talking about.

A. talks
B. talked
C. are talking
D. have been talking

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The two companies haven't （） the price of the new product.

A. agreed to
B. agreed on
C. agreed with
D. agreed in
单项选择题
Mary （） to pass her entrance examination.

A. regulated
B. managed
C. tried
D. handled
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