题目

To understand how these products can be legally promoted to the public,it is necessary to understand something of the laws-----------their regulation
A.covering B.covered C.having covered D.having been covered

提问时间：2021-02-26

答案

A 是现在分词作后置定语,表示主动意义,正确.B covered是过去分词,表示被动意义,错误.C.having covered是covering的完成形式,表示该动作先发于understand,这没必要,故错误.D.having been covered是covered这个过去分...