The ___ of oxygen in the air rises, and at last the air becomes b_英语解答

The ___ of oxygen in the air rises, and at last the air becomes breathable
A. number
B. deal
C. amount
D. mount

人气：188 ℃　时间：2020-05-23 04:46:14

解答

C
A要用a number of
B是a great deal of
D不能加of