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 It'snecessary
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:相似相近词比较题型:选择题...
It'snecessary
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:选择题...
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