—Why does the lake smell terrible?—Because large quantities of water ________.
#99571
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
—Alice, why aren’t you at work today?—I       a day off.
#102771
A
have given
B
have been given
C
gave
D
was given
 Take care! Don’t drop ink on your shirt, for it _______ easily. 
#99906
A
won’t wash out
B
won’t be washed out
C
isn’t washed out
D
isn’t washing out