—Why does the lake smell terrible?—Because large quantities of water______.
#101560
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
Bob called to tell his mother that he couldn’t enter the house, for he ________ his key at school.
#100585
A
had left
B
would leave
C
was leaving
D
has left
The ambulance was just arriving, for a worker, who ______ the window on the second floor, fell off the window.
#102127
A
had been repairing
B
was repairing
C
has been repairing
D
would be repairing
Nelson Mandela__________ peacefully at his Johannesburg home on Thursday，President Jacob Zuma said.
#99626
A
dies
B
died
C
has died
D
had died
--- What’s Joan doing?--- ________ newspapers in the room.
#100971
A
She reading
B
She reads
C
To read
D
Reading