这里的being sent out 是 is 的宾语,所以必须是+ing构成名词形式,而不能用动词原形.
整句话 the major cause of it 是主语 —— （造成）它（臭氧层空洞）的主要原因
is 是谓语 —— 是
the carbon dioxide being sent out 是宾语—— 二氧化碳被排放
the major cause of it is the carbong dioxide being sent out.
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