--Why does the lake smell terrible?    ---Because large quantities of water ______.
#85773
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
This pair of shoes ________ mine. Those shoes __________ John’s.
#44039
A
is; is
B
are; are
C
is; are
D
are; is
Linda and her sister____healthy.
#44051
A
is
B
am
C
be
D
are
Two­fifths of the highway________so far.
#85548
A
has been completed
B
was completed
C
have been completed
D
has completed