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as is often the case 和 as often happens
为什么第一个中要加is而第二个不用呢?
人气：285 ℃ 时间：2020-03-29 17:46:04
解答
一句话只能有一个动词,不能有两个动词啊,happen已经是动词了,所以就不能加is了,前面的一句要是去掉is就没有动词了
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