问题

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

A:when
B:how
C:that
D:if;

正确答案是：

同类题型

I’m really hungry now.That’s because you have left your lunch__________.

The APEC leaders’ meeting greaterimportance to economic cooperation in Asia-Pacific areas.

Millie has _______ than Kitty.

Tom was to blame for the incidentBut _______his positive attitude , we forgave him because “Every man has his faults.”