Our school has about 100 computers, but only sixty percent ____ used regularly.
A．isB．a(chǎn)reC．wasD．were
B

試題分析：句意：我們的學校有100臺電腦，但是通常地僅僅有6%被使用。這里sixty percent 后面省略了of 100 computers，謂語動詞的單復(fù)數(shù)，根據(jù)介詞of后的名詞來確定，這里名詞是可數(shù)名詞，當然謂語動詞用復(fù)數(shù)，根據(jù)前面的動詞可知這里也應(yīng)該用一般現(xiàn)在時，故選B。
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