To look more closely______this situation I spent two weeks there.A.aboutB.upC.forD.at

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To look more closely______this situation, I spent two weeks there.

A.about

B.up

C.for

D.at

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_________。