Question

【题目】—Is it polite ______ others when I talk to them?
—Sorry, I don't know. You can ask Mr. Li.
A.look at
B.looking at
C.to look
D.to look at

Answer 1

【答案】D
【解析】It is + adj.+ to do sth 是固定句型，故排除 A,B ;“看着别人”用 look at others，排除C。故选 D。