问题
选择题
The earthquake ____ when I ____ some cleaning.[ ]
A. starts, was doing
B. started, was doing
C. was starting, was doing
D. was starting, did
答案
答案：B
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The earthquake ____ when I ____ some cleaning.[ ]
A. starts, was doing
B. started, was doing
C. was starting, was doing
D. was starting, did
答案：B