12.The rain had cleared the air,and the grass ______ fresh and sweet
问题描述：
12.The rain had cleared the air,and the grass ______ fresh and sweet
.A.had smelt B.has smelt
C.is smelling D.smelt
答
D
因为前一句话用了过去完成时,是 过去的过去,所以后一句要用过去时,草闻起来很新鲜很甜发生在雨净化空气之后.