What is under the desk?-_________.A.It is a rul

题目

What is under the desk?-_________.A.It is a rul
What is under the desk?
-_________.
A.It is a ruler
B.That is a cat
C.They are red boxes
选哪个?语法是什么?为什么选这个?急,

答案

B C题目问的是单数 显然不能回答复数
A提问可以看出那样东西远离问问题的两个人 所以用 that is