【題目】I don't know who invented ________ telephone. It's really ________ most useful invention.
A.the; a
B./; a
C.a; the
D./; the

【答案】A
【解析】這題考查冠詞，第一空是表示發(fā)明物，特指，加the，第二空：a most useful是“非常有用”，這里的most相當(dāng)于very。選A。

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