Our classroom must be made _______ all the time.A. cleans B. clean C. to clean D. cleaning 答案给的是B 变成被动不是要加to 吗?为什么啊?谢谢各位

we must keep our classroom( ). We must keep our classroom _________(tidily) ( )1.Our teacher often keeps us ________ classroom every day,so we must keep our classroom选择( )1.Our teacher often keeps us ________ classroom every day,so we must keep our classroom .A.clean,clean B.cleaning,cleaning C.cleaning,clean we must make our classroom（）A、clean B、 cleaned C、cleaning Dto clean选择哪个?为什么? Our Engush teacher leaves the classroom so quickly.She___have something important to do.A must B can C mayD will We must keep our classroom (clean) every day we must keep our classroom clean改被动语态 初中英语变为被动语态we must keep our classroom clean -What should we do?-We must keep our classroom _____.A.cleaned B.cleaning C.cleanA,B,C三个选项是什么词性啊? We must listen to our teachers( ) in class B.in the class C.in classroom D.in a class 选哪个? Our classroom ____ every day.△△△丶Our classroom ____ every day.A.must clean B.is clean C.must be cleanD.must be clean▲▲▲丶这道不是选择题是根据句意写出句子中空缺处单词的正确形式、1.Mr Wang enjoys ____ by air(t It's a rule in my class that our classroom -- before 6.00 pm every day.A.be able to clean B.should be cleaning C.must clean D.must be clean Someone left the door of our classroom unlocked yesterday It ____Bruce.He was the last to leaveschoolAshould be B must be C must have been D should have been 分析一下句子成分（英语）谢谢We must keep our classroom tidy and clean. We must clean our classroom.改为被动句式的肯、否、一般疑问. You must take your classroom （ ） ...You must take your classroom （ ）A clean B cleaned C cleanning D cleans Miss Guo tells us something.She says we must keep our classroom clean.合并句子Miss Guo tells us ( ) ( )our classroom clean. Our classroom is ____larger that theirs..A.more B.much