—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
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Although the causes of cancer_____, we do not yet have any practical way to prevent it.
#104936
A
are being uncovered
B
have been uncovering
C
are uncovering
D
have uncovered
She offered to give me a lift, but I my bike, so I went to the cinema alone.
#100328
A
had ridden
B
have ridden
C
will
D
was riding
----Did you tell Julia about the result? -----Oh, no, I forget. I _____her now.
#99292
A
will be calling
B
will call
C
call
D
am to call
—Did you watch the movie Mei Lanfang in the People’s Theatre last night?— I had planned to, but it ________ hard all the time.
#104205
A
is raining
B
was raining
C
has rained
D
had rained
—Well, that was really a good meal. I _______ you were a really good cook.—Thank you.
#104832
A
didn’t know
B
don’t know
C
haven’t know
D
hadn’t known