We all know that a smile is usually a sign ________ people feel friendly and hap

题干

We all know that a smile is usually a sign ________ people feel friendly and happy.

A．when

B．how

C．that

D．if

上一题下一题 0.64难度单项选择更新时间:2016-12-22 11:53:47

小学学科试题库

初中学科试题库

高中学科试题库