Parts of the cave have been badly affected by rain and           to the air.
#5758
A
express
B
excavate
C
exposure
D
expand
推荐题目
The advice is of great ___ to our work.We all think it_____.
#7414
A
uses ; good
B
useless; bad
C
use;good
D
useful; fine
The advice is of great ________ to our work. We all think it ________.
#6473
A
uses, good
B
useless, bad
C
use, good
D
useful, fine