I want to know the thief was caught on the spot.A. whichB. thatC. whatD. whether

问题补充：

I want to know the thief was caught on the spot.

A. which

B. that

C. what

D. whether

答案：

A. which

B. that

C. what

(答案→)D. whether

解析：主要测试宾语从句。句子意思：我想知道那个小偷是不是在现场被抓的。结合句子的语境可得答案。另外也可以题干和答案同时进发，向答案逼近。例如：The teacher wants to know whether the student can come back to school the next afternoon。老师想知道这位学生明天下午能否返校。