--- What did your parents think about your decision?
--- They always let me do I think I should.
A. when
B. that
C. how
D. what
网友回答
A. when
B. that
C. how
(答案→)D. what
解析：主要测试宾语从句。句子中动词do缺少宾语，另外省略句I should （do）中也缺少宾语，该题也属于所选词应该起到双重作用，因此答案为what。句子意思----你父母感觉你的决定如何啊？----他们总是让我做我认为应该做的事情。例如：I will do what I can （do）to help the old man。我尽可能做自己能做的事来帮助那位老年人。