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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.

—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