He will not fail___(pass) the driving test if he keeps (prac

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He will not fail___(pass) the driving test if he keeps (practise).《用适当的非谓语动词形式填空》
第二个空不用回答.第一个空为什么是to pass?为什么要加to?我填passed为什么不可以呢?

因为是fail to do sth.才是做某事失败的意思.不可以填passed,不然就有两个动词了.
再问： fail to do sth。有这个语法吗?
再答：当然有。以下是牛津高阶词典的相关解释，绝对不会错： fail: forget, neglect or be unable (to do sth) 忘记﹑ 忽视或未能（做某事）: He never fails to write (ie always writes) to his mother every week. 他每周都给母亲写信. * She did not fail to keep (ie She did keep) her word. 她没有食言. *

He will not fail___(pass) the driving test if he keeps (prac he f__to pass the driving test because he was ne he has succeed ___（pass）the driving test he passed the driving test.so ..everyone if he or if he is not r____,he may fail to pass the test He was c_____ to pass the driving test.In fact he did it. We hope he will _(成功) pass the test Though he tired his best to pass the driving test , ___he fa if you don't work hard, you will fail___(pass）the exam He (不及格） the driving test yesterday If he (not listen) to the teacher carefully,he can not pass How come__to pass the driving test?