Dogs___are usually quiet have started to bark.A.they B./ C.that请说明原因

问题描述:

Dogs___are usually quiet have started to bark.A.they B./ C.that请说明原因

DOG WHICH ARE USUALLY QUIET...............。WHICH带着的句子形容DOGS。

C.that
从结构来看,此部分___are usually quiet 应该为定语从句,由于指物,做主语,用关系代词that