The computer is ______useful tool in _______world today.A．an; theB．a; theC．the;
题型：不详难度：来源：
The computer is ______useful tool in _______world today.| A．an; the | B．a; the | C．the; the | D．a; a |
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答案
| B |
解析
试题分析：句意：今天电脑是世界上一种有用的工具。不定冠词a/an表示某一类人或某事物中的任何一个,经常用在第一次提到某人或某物时,用不定冠词起介绍作用，表示一个。a用于辅音音素前an用于元音因素前。useful，辅音音素开头，in the world,在世界上，故选B。 |
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