he always fails __the door when he leaves.A.locking B.lock C.to lock D.in locking 求大神解答!要细致一点!

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he always fails __the door when he leaves.A.locking B.lock  C.to lock  D.in locking  求大神解答!要细致一点!

he always fails __the door when he leaves.A.locking B.lock C.to lock D.in locking 求大神解答!要细致一点!
he always fails __the door when he leaves.
A.locking B.lock C.to lock D.in locking 求大神解答!要细致一点!

he always fails __the door when he leaves.A.locking B.lock C.to lock D.in locking 求大神解答!要细致一点!
C.to lock
fail to do sth 
后面接不定式,是固定用法.
没能做成某事
当他离开的时候,他总是锁不上门.

希望对你有帮助.

C
fail to do sth 做不成某事;

他总是走时不关门

答案:C.to lock
fail to do:未能做某事。