Don't come in before knocking at the door.before 后面的 knocking用的对吗?

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Don''tcomeinbeforeknockingatthedoor.before后面的knocking用的对吗?Don''tcomeinbeforeknockingatthedoor.before后面

Don't come in before knocking at the door.before 后面的 knocking用的对吗?
Don't come in before knocking at the door.
before 后面的 knocking用的对吗?

Don't come in before knocking at the door.before 后面的 knocking用的对吗?
介词后用动名词,没错~!

没错吧..