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请选出答案并解释一下下题中make an attempt to do 和make an efforts to do的区别

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请选出答案并解释一下下题中make an attempt to do 和make an efforts to do的区别..
He made an____to solve the problem,but failed again.
A.attempt B.efforts C.development D.experience
请选出答案并解释一下下题中make an attempt to do 和make an efforts to do的区别
应选择A答案,
make an attempt to do ;尝试做……事;=try to do
make an efforts to do;努力去做……事;=try hard to do
A.attempt B.efforts C. development D.experience
A.尝试 B.努力 C.开发 D.经验
他____解决这个问题,但又失败了.
C、D意思不对,则正确答案在A、B当中,
但B选项中;efforts 前面有an,可efforts是复数所以也不选B,
所以选择A答案.
谢谢!
选我吧!
3Q!~~~~~~