摘要：34．-Why is the classroom so dirty? -Sorry.sir. It yesterday We forgot to do it. A. doesn’t clean B. didn’t clean C. sn’t cleaned D. wasn’t cleaned
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—Why is the classroom so dirty?
—Sorry，sir. It yesterday, We forgot to do it.
| A．doesn’t clean | B．didn’t clean |
| C．isn’t cleaned | D．wasn’t cleaned |
—Why is the classroom so dirty?
—Sorry，sir. It yesterday, We forgot to do it.
A．doesn’t clean B．didn’t clean
C．isn’t cleaned D．wasn’t cleaned
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