1.-Where do you think________he_______the computer?-Sorry,I have no idea.A.had ; bought B.has ; bought C.did; buy D./; bought

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1.-Where do you think________he_______the computer?-Sorry,I have no idea.A.had ; bought B.has ; bought C.did; buy D./; bought
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1.-Where do you think________he_______the computer?-Sorry,I have no idea.A.had ; bought B.has ; bought C.did; buy D./; bought
1.-Where do you think________he_______the computer?
-Sorry,I have no idea.A.had ; bought B.has ; bought C.did; buy D./; bought

1.-Where do you think________he_______the computer?-Sorry,I have no idea.A.had ; bought B.has ; bought C.did; buy D./; bought
D
do you think ...后面跟的一个宾语从句,提问时要将宾语从句的特殊疑问词提到句首,因此可以这么看这个句子:
where () he () the computer?
即他在哪里买的电脑?原本应该是did / buy,但宾语从句规定从句的语序要用正常语序,即主+谓,因此不需要向平时一样将助动词提前到主语,保持正常陈述句语序,he bought 就可以
因此D是正确的

D./;bought
插入语do you think后面要用陈述语序,故A,B,C错。

选C.do you think 是插入语。“你认为他在哪里买的这台电脑?”强调过去的动作,所以用过去时。

D./; bought
如果去掉插入语 do you think, 就是很单纯一条问句: Where did he buy the computer?
加了 do you think ,后面成为宾语从句,did he buy 就不能用了,必须改为 he bought.