—Why does the lake smell terrible?—Because large quantities of water_______________.
#99629
A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
This August will be very precious for graduates by which time they _________into a university.
#101535
A
will be admitted
B
will have admitted
C
have been admitted
D
will have been admitted
They ________ to enter the building by the back door; however, the front door was locked.
#102352
A
are supposed
B
aren’t supposed
C
weren’t supposed
D
were supposed
Sorry to have kept you waiting. You must have thought ___.
#99981
A
we are not coming
B
we were not coming
C
we did not come
D
we were not come
—I’ve got to go now.— Must you? I _________ you could stay for dinner with us.
#101998
A
think
B
have thought
C
thought
D
am thinking