when the child returned home,__with dust,his parents began to complain.A.covered B.covering C.to be covered D.having covered

when the child returned home,__with dust,his parents began to complain.
A.covered B.covering C.to be covered D.having covered

A
当这个孩子回家时,已经被灰尘覆盖了,他的父母开始埋怨.
这里A 中的covered是动词的过去分词,表示被动.

A 中的covered是动词的过去分词，表示被动。