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.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、