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That problem by some teachers in their offices at the present time. A．is been st

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That problem by some teachers in their offices at the present time. A．is been st

That problem________by some teachers in their offices atthe present time.

A．is been studied

B．is being studying

C．is been studying

D．is being studied

 

试题答案

答案：D

标签：inteachersofficestheirproblem

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