The American boy understood nothing,___he?A.did B.doesn't C.does D.didn't 在A和D之中,选择哪一个?为什么?

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The American boy understood nothing,___he?A.did B.doesn't C.does D.didn't 在A和D之中,选择哪一个?为什么?

The American boy understood nothing,___he?A.did B.doesn't C.does D.didn't 在A和D之中,选择哪一个?为什么?
The American boy understood nothing,___he?A.did B.doesn't C.does D.didn't 在A和D之中,选择哪一个?
为什么?

The American boy understood nothing,___he?A.did B.doesn't C.does D.didn't 在A和D之中,选择哪一个?为什么?
A