When a pencil is partly in a glass of water, it looks as if

问题描述：

When a pencil is partly in a glass of water, it looks as if __
A breaks B has broken C were broken D had been broken
我知道正确答案是C,但不知道为什么要用were,pencil 不是单数吗?

1个回答分类：英语 2014-09-28