The children _____ happily in the classroom when the teacher came in.
A. talk
B. are talking
C. were talking
D. had talked
A. talk
B. are talking
C. were talking
D. had talked
【答案】
A. talk
B. are talking
C. were talking
D. had talked
A. talk
B. are talking
C. were talking
D. had talked
【答案】
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