13.Every minute is made full use of at our lessons.13.Every minute is made full use of at our lessons.A.to work B.working C.having worked D.being worked这种题.解题关键是什么?

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13.Everyminuteismadefulluseofatourlessons.13.Everyminuteismadefulluseofatourlessons.A.toworkB.workin

13.Every minute is made full use of at our lessons.13.Every minute is made full use of at our lessons.A.to work B.working C.having worked D.being worked这种题.解题关键是什么?
13.Every minute is made full use of at our lessons.
13.Every minute is made full use of at our lessons.
A.to work B.working C.having worked D.being worked
这种题.解题关键是什么?

13.Every minute is made full use of at our lessons.13.Every minute is made full use of at our lessons.A.to work B.working C.having worked D.being worked这种题.解题关键是什么?
of是介词,所以后面的动词要用现在分词形式.
而这里不需要用到have或be做助动词.直接用working就行、