摘要： When was the earthquake?
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The earthquake ____ when I ____ some cleaning.
| A．starts, was doing | B．started, was doing |
| C．was starting, was doing | D．starts, were doing |
The earthquake ______ when I _______some cleaning.
| A．starts, was doing | B．started, was doing |
| C．was starting, was doing | D．starts, were doing |
The earthquake ______ when I _______some cleaning.
A. starts, was doing?? B. started, was doing
C. was starting, was doing D. starts, were doing
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