They have put______a plan to improve the traffic in this metropolis.A.awayB.acrossC.outD.f

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They have put______a plan to improve the traffic in this metropolis.

A.away

B.across

C.out

D.forward

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_________。