Question

【题目】 I thought about ______ over and over in my head and finally worked out how to do it.

A. what I have to do

B. I had to do what

C. what I had to do

D. what I to do

Answer 1

【答案】C

【解析】试题分析：句意：我在脑子里一次又一次的考虑我必须做什么，最后想出怎样去做。这里是what引导的宾语从句，注意用陈述语序，短语have to do sth.表示不得不，必须做某事。据谓语动词是过去时，宾语从句也应该用过去时态，故选C。