What is a writing brush ,do you know?It's____writing and drawing.

问题描述:

What is a writing brush ,do you know?It's____writing and drawing.

答案是C吗,如果as的话是不是被用做什么什么啊问题补充:应该是It

for,用于

for
for在这里是“用来”的意思
It is for就是说“它是用来”
翻译:毛笔是什麽,你知道吗?它是用来写字和画画的.