—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
Father ____ for London on business upon my arrival, so I didn’t see him.
#100323
A
has left
B
left
C
was leaving
D
had left
When their first child was born, they _________ for three years.
#103499
A
had married
B
had been married
C
got married
D
had got married
After being．discovered by Dutch explorers in 1606，the eastern half of Australia_____by the British in 1770．
#104553
A
was claimed
B
claimed
C
was claiming
D
has been claimed
When the festival they have been looking forward to _______, people will dress up to celebrate it.
#100790
A
coming
B
comes
C
come
D
came
---When will the plane leave? ---It ________ very soon.
#101799
A
leaves
B
is leaving
C
has left
D
had left