Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 7 to 21.They ______ the floor when their mother came home. A. cleaned

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions from 7 to 21.

They ______ the floor when their mother came home.

A. cleaned
B. were cleaning
C. clean 
D. are cleaning

Trả lời

Chọn B

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