Question

【题目】—Colin,what's this in English?
—__________.
A.It's pen
B.It's a pen
C.This is a pen

Answer 1

【答案】B
【解析】what's this……？常用It's……回答。pen为可数名词，需加冠词a，表示数量“一”。根据题意，故选择B。