题目内容
The students ________ their homework when the teacher _____ into the classroom.
A. did, came
B. were doing, came
C. were doing, was coming
D. did, was coming
答案:B
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题目内容
The students ________ their homework when the teacher _____ into the classroom.
A. did, came
B. were doing, came
C. were doing, was coming
D. did, was coming