Question

【题目】Pens are helpful to humans. Students use pens for _______.

A. writeB. writesC. wroteD. writing

Answer 1

【答案】D

【解析】

句意：钢笔对人类是有用的。学生们用钢笔来写字。A．write写，动词原形；B．writes写，动词的单数第三人称形式； C．wrote写，动词的过去式； D．writing写，现在分词形式或动名词形式。use sth for doing sth使用某物做某事，是固定搭配。故用writing。故选D。