We have made a try to carry out the plan.A.attemptB.effortC.energyD.source

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We have made a try to carry out the plan.

A.attempt

B.effort

C.energy

D.source

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗