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—What’s ______ most useful invention in the 20th century?
—______ computer, I think.
A.the, A B.a, A C.the, TheD./, The
C
考察冠词。最高级前面要加冠词,表示特指。下文指的是上文提到在20世纪最有用的发明,为特指,用定冠词。故选C。
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