The days______ you could travel without a passport are a thing of the past.A.wheneverB.whe

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The days______ you could travel without a passport are a thing of the past.

A.whenever

B.wherever

C.on which

D.in which

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_________。