While Ms. Nhung was teaching in Class 4B, she ______ ...

[ Tenses ]

While Ms. Nhung was teaching in Class 4B, she ______ a piercing scream outside.

A. heard

B. has heard

C. was hearing

D. had heard

Select your answer:
A B C D E

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A. am prefering

B. prefer

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A. have been touring
B. toured
C. has been touring
D. is touring

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A. What

B. Do

C. Did

D. Am

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A. lose

B. lost

C. has lost

D. have lost