Official 11 Lec 1
Question 4 of 6
Why does the professor say this:

A.

To introduce an explanation

B.

To express uncertainty

C.

To point out an error

D.

To emphasize a point that should be obvious

正确答案:A

显示答案
进入答题
00:00
00:00
隐藏原文

译文

精听文本