1 know Bob______but I have never actually spoken to him.A.by sightB.out of sightC.in sight

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1 know Bob______but I have never actually spoken to him.

A.by sight

B.out of sight

C.in sight

D.on sight

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_________。