British adventurer and swimmer Lewis Gordon Pugh became the first person to swim in the icy waters of North Pole，to raise awareness of how global warming ______ the polar ice cap.
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A
had affected
B
is affecting
C
affected
D
will affect
推荐题目
— What about your self-drive trip yesterday? — Tiring! The road Was being widened，and we _________ rough ride.
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A
have
B
would have
C
had
D
have had
Danny _____ hard for long to realize his dream and now he is popular.
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A
works
B
is working
C
has worked
D
worked
Mary, stop to have a rest. You _________ the flowers in your garden for nearly two hours.
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A
are watering
B
were watering
C
water
D
have been watering
I would have helped you, but I ________ really occupied the whole week．
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A
was
B
am
C
had been
D
were
They started off at about 5 o’clock in the morning . They should there by now .
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A
arrive
B
have been arriving
C
have arrived
D
be arriving