It's(common)in the USA that students have classes on sundays适当形式填空

问题描述:

It's(common)in the USA that students have classes on sundays适当形式填空

common
adj.普通的;常见的
it is/was + n/adj.+that从句/to do

uncommon 不寻常的;罕有的

common adj.普通的;常见的
it is/was + n/adj.+that从句/to do

incommon

uncommon
形容词 a.
不寻常的;罕见的