don't leave for tomorrow you can do today.A.if B.what C.that

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don't leave for tomorrow you can do today.A.if B.what C.that D.unless 答案是B可是我很纠结其他的选项错在哪里,

句子缺少主语,在选项中只有what可充当主语成分.
加if,you can do 后缺成分
unless 语法句义都不通
that 不能当主语,可当宾语
再问：你好很感谢你的回答，还有个疑问，你说what可以做主语而that不可以，可是他们同为代词为什么what就可以？
再答：宾语从句中如果成分不缺的话用that，that what u can do today。缺失宾语的话用what ,即what u can do=u can do what，后一个what是宾语。

don't leave for tomorrow you can do today.A.if B.what C.that I don't know____I can do for you.A.who B.that C.what D.if为什么 today i do what you don't do,tomorrow i do what you can't do Don't put off till tomorrow ____you can do today.A.What B,th Don't leave for tomorrow_____you can do today. Don't ___until tomorrow what can be done today a.put away b. Never____till tomorrow what you can do today.A.put off B.put When ( ) you ( ) beijing? Tomorrow. A.do ;leave for B.were ; I don't know what I can do for you 为什么用what不用that What can I do for you AI don't need help B.thank you C.yes,p __you don't go to college A.what if B.what will do C.what to If you don't love me.what can I do?