题干
—Wow. It is rather cold today.
—Yes. ____ yesterday.
A：So it is
B：So it was
C：So was it
答案(点此获取答案解析）
C
—Wow. It is rather cold today.
—Yes. ____ yesterday.
A：So it is
B：So it was
C：So was it
时，需要做一些假设和选择一些理论依据，下列必要的假设和理论依据有( )
