Not until the game had begun______at the sports guound.A.had they arrivedB.would they have

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Not until the game had begun______at the sports guound.

A.had they arrived

B.would they have arrived

C.did they arrive

D.should they have arrived

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。