Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't

you must clean the window对clean the window提问 Are they [ ] [clean] the room. You must keep the bedroom ______(clean) We must ___(keep) the classroom clean. You must clean the classroom.(改为祈使句) 如果用must 提问一般疑问句,否定回答用什么?如题：Must they clean the classroom now?否定回答是什么? Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't为什么选d Must they clean the classroom now?No,they ___.A.can't.B.needn't.C.don't.D.mustn't Did they clean the room?怎么回答? they prefer__(not clean)the room will they clean the room 改为陈述句 they must dust the room You must clean the floor 改为同义句( ) ( )the floor They must clean their classroom every day改为同一句They （）（） clean their classroom every day Everyone must ( ) the classroom ( ). A.keep; to cEveryone must ( ) the classroom ( ).A.keep; to clean B.keeps; to clean C.keeps; clean D.keep; clean some people ____much rubbish behind after they played on the beach.we must tell them to keep theenvironment clean.A threw B put C left D picked they keep the streets clean by picking up rubbish _________do they keep the streets clean? We must clean the room 的 clean the room疑问句是_____ ______we do?