Li lei tried hard _____(work) out the problem.能不能用working

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Lileitriedhard_____(work)outtheproblem.能不能用workingLileitriedhard_____(work)outtheproblem.能不能用working

Li lei tried hard _____(work) out the problem.能不能用working
Li lei tried hard _____(work) out the problem.能不能用working

Li lei tried hard _____(work) out the problem.能不能用working
不能 动词后再加动词用动词不定式 句中已有动词try所以第二个动词work加to
另外try to do是固定结构
有问题可以继续追问~