It is generally believed that only________of our brain________.

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问题 It is generally believed that only________of our brain________.

选项 A、ten percent; is used
B、ten percents; is used
C、ten percent; are used
D、ten percents; are used

答案A

解析 百分数的表达方式为“基数词小数percent”,其中,percent后不加“百分数+of+名词/代词”作主语时,谓语动词应与of后面名词或代词的数保持一致。本句中of后面的名词短语的中心词是brain,为可数名词单数,所以从句的谓语动词应用单数形式。故选A。
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