I ran______some old letters when I was looking for something else.A.aboutB.downC.acrossD.o

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I ran______some old letters when I was looking for something else.

A.about

B.down

C.across

D.off

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_________。