This kind of gel pen which smoothly is quite popular with students.A. is writtenB. is wri

问题补充：

This kind of gel pen which smoothly is quite popular with students.

A. is written

B. is writing

C. wrote

D. writes

答案：

A. is written

B. is writing

C. wrote

(答案→)D. writes

解析：句意为：这种写起来非常流畅的中性笔很受学生的欢迎。部分动词如tear, sell, write等可用主动形式也可用被动形式，当说明事物本身所具备的性质时要用主动表被动的形式，当说明具体的动作时要用被动语态。Fg: The kind of paper tears easily.

说明这种纸易撕烂，是主语的性质。本题即考查这种笔所具备的特点，故用现在时的主动语态。A为一般现在时的被动语态，B为现在进行时，C一般过去时。