When Miss Wang walked into the classroom in the morning, ...

[ Grammar ]

When Miss Wang walked into the classroom in the morning, all the students _____ the classroom at that time.　

A. clean

B. cleaned

C. is cleaning

D. were cleaning

Select your answer:

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Frequency Asking & Giving Opinion Finite and Non-Finite Verb Active-Passive Voices Adjectives or Adverbs Grammar - Countable/ Uncountable Unreal Conditionals Grammar Rules Verbs: Will & Going to

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