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
C
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科目：高中英語 來源：期末題 題型：單選題

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

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