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
Professor Smith, along with his assistants, _________on the project day and night to meet the deadline.
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A
work
B
working
C
is working
D
are working
The last time I _______ Jack, he _______ football with classmates.
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A
had seen; was playing
B
saw; played
C
had seen; playing
D
saw; was playing
（2014年(春)重庆市高三考前冲刺测试卷）8. Asia ______ the popularity of South Korean culture that has been flooding other countries since turn of the century.
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A
had been increasingly feeling
B
increasingly felt
C
will increasingly feel
D
is increasingly feeling
.—_______ John this week?—Yes.—Where _______ him?—In the library.
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A
Did you see; did you see
B
Have you seen; did you see
C
Do you see; have you seen
D
Have you seen; have you seen