關於Itsnecessary的知識

問題詳情： It'snecessary_______ustokeeptheclassroom_______everyday.   A.for;cleans    B.of;clean       C.for;clean     D.of;cleaning【回答】C知識點：相似...

問題詳情：It'snecessary____us_____ readEnglisheverymorning.A.for;/           B.  for;to           C.of;to   【回答】B知識點：介詞和介詞短語題型：選...