-Why does the Lake smell terrible?-Because large quantities of water__________. 
#104945
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
-----Are you still very busy?-----Yes, I ______ the report for the manager and it won’t take long.
#100851
A
have just finished
B
am just finishing
C
had just finished
D
am just going to finish
Betty will ring me up as soon as she ______ in Beijing.
#101706
A
arrive
B
arrives
C
arrived
D
will arrive