【题目】Convenient ______ plastic bags are for people, they will cause white pollution.
A. as B. although
C. since D. while
在线课程【答案】A
【解析】
考查形式倒装句。句意：对人们来说尽管塑料袋很方便，但它们会导致白色污染。句中形式倒装句“Convenient as plastic bags are for people”相当于让步状语从句“Although plastic bags are convenient for people”，故A项正确。