they have swpet the filoor and cleaned the window.(改为否定句) they____ swpet the filoor ____clean

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they have swpet the filoor and cleaned the window.(改为否定句) they____ swpet the filoor ____clean
they have swpet the filoor and cleaned the window.(改为否定句) they____ swpet the filoor ____clean

they have swpet the filoor and cleaned the window.(改为否定句) they____ swpet the filoor ____clean
haven't,or