关于Itsnecessary的知识

问题详情：It'snecessary____us_____ readEnglisheverymorning.A.for;/           B.  for;to           C.of;to   【回答】B知识点：介词和介词短语题型：选...

问题详情： It'snecessary_______ustokeeptheclassroom_______everyday.   A.for;cleans    B.of;clean       C.for;clean     D.of;cleaning【回答】C知识点：相似...