what's in the pencilbox?回答时用There is a pen.还是 It's a pen.并解释为什么.
问题描述：
what's in the pencilbox?回答时用There is a pen.还是 It's a pen.并解释为什么.
答
It's a pen
what's 是WHAT IS的意思要用It's回答,这是固定搭配