In the past decades, sea ice ______ in the Arctic as a result of global warming.
#100763
A
had melted
B
has been melting
C
melted
D
is melting
推荐题目
Bob would have helped us yesterday, but he-_______
#101066
A
was busy
B
is busy
C
had been busy.
D
will be busy
Good heavens! There you are! We _____ anxious about you, and we _____ you back throughout the night.
#104714
A
are; expect
B
were; had expected
C
have been; were expecting
D
are; were expecting
—That must have been a terrifying experience. —Yeah. I _____ in the damaged car, unable to move.
#101867
A
was stuck
B
have been stuck
C
am stuck
D
had been stuck
I _______ to help you but I was not able to spare any time.I _______ a paper last night and I'll have to finish it today.
#104536
A
wanted; have been writing
B
have wanted;wrote
C
had wanted; wrote
D
had wanted;was writing
He ___________busy yesterday, or he __________you with your experiment.
#100168
A
was; had helped
B
was; would have helped
C
had been; would have helped
D
were; would have helped