问题补充:
There are lots of plastic bags in the river, it very dirty.
A. floating; making
B. to float; made
C. being floated; made
D. floated; making
答案:
(答案→)A. floating; making
B. to float; made
C. being floated; made
D. floated; making
解析:因为整个句子已经有谓语动词,故应用非谓语动词,第一空bags与float之间是主动关系,故用现在分词表示主动与进行;第二空making来表示自然而然产生的结果。故选A。