So many students _for the traffic jam ,the exam had to be pu

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So many students _for the traffic jam ,the exam had to be put off.
A.were late
B.had been late
C.being late
D.been late(选什么,为什么?）

选C,非谓语
主句the exam had to be put off的主谓是完整的
So many students being late for the traffic jam 用ing表示原因的状语从句,由于主从句的主语不一致,所以从句自己跟上了主语So many students ,如果一致的情况下,从句的主语可以省略!

So many students _for the traffic jam ,the exam had to be pu So many students were late for the traffic jam.属于一、主语+不及动词二 So many diretors being absent,the board meeting had to be pu so many students ( ) because of the bad weather,the exam had so many students __,the test had to be put off so many representatives_ ,the conference had to be put off 8.a heavy traffic jam on the highway the taxi driver had to she had expected the exam to be The traffic is jam. _____ in the traffic jam,he was likely to be late for the jo In order not to be held ____in the traffic jam ,they went to in traffic jam还是in the traffic jam