homework______on time will lead to better grades.

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homework______on time will lead to better grades.
a.be done b.done c.having done d.to have been done
请问该如何选择,能不能选D?

B
if homework is done on time,it will lead to better grades
homework与do是被动的关系所以用done
在非谓语动词中 to do 有将来的含义,如果没有明确的时间状语,一般不用完成时态的
C本身就是个错误
A是谓语形式,不是非谓语

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