Milly is crying. There must be something ___ to her.A.happen

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Milly is crying. There must be something ___ to her.A.happen B.happens C.happened D.happening
Milly is crying. There must be something ___ to her.
A.happen B.happens C.happened D.happening
答案是选D,但我认为是C.我们老师给我的解释是Milly正在哭,所以一定是有什么事正在她身上发生.因为这些事她才哭的.但是为什么不能是已经发生了的事她想起来才哭的呢?英语中一句的时态有什么讲究没?

同学,注意一个关键点：happen 不及物动词,不能用于被动语态,你看前面有个be ,再加上C 过去分词,就是被动语态,明显的语法错误啊.
如有疑问,请追问.
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书山有路勤为径,学海无涯苦作舟.
-----------与君共勉-----------
再问：选D可以看成现在进行时，如果改成There must something ___ to her.是不是可以选C？
再答：可以
再问：谢谢。还有个问题，就是“他昨天一定踢了足球”可以表达为“He must play football yesterday."吗？
再答： He must 【have】played football yesterday 对过去肯定的猜测最好用must have done这个句型
再问：我是想问must后面要跟原型，played需要变为play时这个一般过去时的句型还成立吗？
再答：成立。

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