what's_?__a pen ?a 、this;this is b 、this;it's c 、 that;that's d、 that'

问题描述:

what's_?__a pen ?a 、this;this is b 、this;it's c 、 that;that's d、 that'

What's this?这是什么?
It is a pen?是支钢笔吗?