作业帮It's your duty__the classroom___.A to keep ,clean B to keep ,cleaningC keep,clean D for keeping ,clean
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It's your duty__the classroom___.A to keep ,clean B to keep ,cleaningC keep,clean D for keeping ,clean
It's your duty__the classroom___.A to keep ,clean B to keep ,cleaning
C keep,clean D for keeping ,clean
It's your duty__the classroom___.A to keep ,clean B to keep ,cleaningC keep,clean D for keeping ,clean
A 保持教室干净整洁是你的义务. 此处是It 做形式主语的用法 It is .+to不定式 同时keep+sth+adj.形式中宾语补足语应该为形容词adj.形式
选A
it is one`s duty to do s.th做某事是某人的职责
形容词clean在这里做宾语classroom的补语
A
It's your duty__the classroom___.A to keep ,clean B to keep ,cleaningC keep,clean D for keeping ,clean
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