—What’s ______ most useful invention in the 20th century?
—______ computer, I think.
A．the, A B．a(chǎn), A C．the, TheD．/, The
C
考察冠詞。最高級(jí)前面要加冠詞，表示特指。下文指的是上文提到在20世紀(jì)最有用的發(fā)明，為特指，用定冠詞。故選C。
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