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I don’t know who invented _____digital camera, and it’s really _____ most useful invention.
A.the; aB.the; theC.a; aD.不填;不填
A
第一空是特指;第二空a most 相当于 very的意思,the most才是最高级,而且通常后面是要加一个范围的,比如in the world。
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