When Edison was very young ,he liked to find out how ___.A.did things work B.do things work C.things work D.things worked

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When Edison was very young ,he liked to find out how ___.A.did things work B.do things work C.things work D.things worked
When Edison was very young ,he liked to find out how ___.
A.did things work B.do things work C.things work D.things worked

When Edison was very young ,he liked to find out how ___.A.did things work B.do things work C.things work D.things worked
选D 这里考察宾语从句用陈述句语序的知识.即主语在前,谓语在后.C中时态不对,A和B中不能要助动词

D 正确。
how 引导的宾语从句,用陈述句语序

我觉得应该选B,因为前面用了过去式,后面就应该是原型。