--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
A library with seven thousand books _____ to the area as a gift.
#86223
A
is offered
B
have offered
C
are offered
D
has offered
Many a student ________ failed in the biology exam,and Tom is the only one of them who ________ decided to give up the course.
#85618
A
have;has
B
have;have
C
has;have
D
has;has
The Smiths ______ their breakfast when the doorbell rang.
#86177
A
had
B
has been having
C
are having
D
were having
