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The teacher, along with his students, experiments in the laboratory when the exp

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The teacher, along with his students, experiments in the laboratory when the exp

The teacher, along with his students, _____ experiments in the laboratory when the explosion happened.

[     ]

A. were doing
B. have been doing
C. was doing
D. had done

试题答案

C

标签：experimentsstudentsinlaboratorythe

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