Its time that we ______ firm measures to protect our environment.A.have takenB.tookC.are t

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Its time that we ______ firm measures to protect our environment.

A.have taken

B.took

C.are taking

D.will take

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_________。