【題目】People found it easier ________ after the invention of zero.

A.calculateB.calculatingC.to calculateD.calculated

【答案】C

【解析】

句意：人們發(fā)現(xiàn)在發(fā)現(xiàn)0之后，計算更容易了。

本題考查的是it作形式賓語，句型find it adj to do sth發(fā)現(xiàn)做某事很… 所以應(yīng)該用不定式，故答案選C。

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