--How much ___ this pair of pants? --___ 30 dollars. A.is It's B.are They're C.is They're D.are It'
问题描述：
--How much ___ this pair of pants? --___ 30 dollars. A.is It's B.are They're C.is They're D.are It'
我没有悬赏分能补，非常抱歉，但是，我想先声明，答案应该不是A，因为我就是写A，但错了。希望有人能告诉我除了这个A之外，选B、C、D的理由。谢谢。
答
is It's 一双鞋是单数,记住就ok了