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________ happens in the world makes us happy and sad too.

A. That         B. What               C. Which                    D. Whether

B  


解析:

       题意:世界上发生的事使我们高兴也是我们悲伤。本题考查引导主语从句的连接词。that引导主语从句只起连接作用,在从句中不作任何成分,无意义,但不能省略。what除引导主语从句外, 还在从句中作成分。which指一定范围内的“哪一个”;whether意为“是否”。根据句意“世上的事喜忧交替”可知答案为B

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