考博考试

【单选题】 ______ that the earth was flat
A．Used it to be thought
B．Did it used to be thought
C．Was it used to being thought
D．Does it used to be thought

网考网参考答案：A
网考网解析：
It used to do句型的疑问句形式可以为Used it to do...或者Did it use to do... 查看试题解析出处>>