Thequestionnewmeasuresshouldbetakentocontroltheterribleairpollutionispuzzlesscientistsalot．（）A.that；whatB.which；thatC.what；whatD.which；that

Question

The question _____ new measures should be taken to control the terrible air pollution is ____ puzzles scientists a lot．（　　）

A. that； what

B. which； that

C. what； what

D. which； that

Answer 1

答案：A
分析句式可知，_____ new measures should be taken to control…是一个同位语从句，修饰名词questions，在从句中不缺成分，所以用that引导，没有具体意思但不能省略；第二空____ puzzles scientists a lot是一个表语从句，从句中缺少主语，所以用what引导，意为…的．