The computer is ______useful tool in _______world today.
A．a(chǎn)n; theB．a(chǎn); theC．the; theD．a(chǎn); a
B

試題分析：句意：今天電腦是世界上一種有用的工具。不定冠詞a/an表示某一類人或某事物中的任何一個(gè),經(jīng)常用在第一次提到某人或某物時(shí),用不定冠詞起介紹作用，表示一個(gè)。a用于輔音音素前an用于元音因素前。useful，輔音音素開頭，in the world,在世界上，故選B。
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