摘要：( ) --- 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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---Why is the classroom so dirty?
--- Sorry, sir. It ______ yesterday. We forgot to do it.
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--- 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.
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——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.
——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 |