by a passing plane,和by a knock at the door1.he strated to complainthis wicked world but was interrupted by a knock at the door.2.i think this house must be koncked down by a passing plane为什么加a不是by后不加a吗?
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by a passing plane,和by a knock at the door1.he strated to complainthis wicked world but was interrupted by a knock at the door.2.i think this house must be koncked down by a passing plane为什么加a不是by后不加a吗?
by a passing plane,和by a knock at the door
1.he strated to complainthis wicked world but was interrupted by a knock at the door.2.i think this house must be koncked down by a passing plane为什么加a不是by后不加a吗?
by a passing plane,和by a knock at the door1.he strated to complainthis wicked world but was interrupted by a knock at the door.2.i think this house must be koncked down by a passing plane为什么加a不是by后不加a吗?
介词 by 后面的宾语各种各样,加 a/an 表达“一个”毫无问题啊,比如：
The following program will be presented by a group of well known scientists.一群著名科学家
This film is directed by an American.一个美国人
通过一辆经过的飞机
通过一次敲门
是抽象名词具体化