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It was global warming , rather than other causes , ______ led to the extreme weather .
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which
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who
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that
D
what
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----How unhappy your roommate looks!----Yes，but he’s not willing to tell me what it is____ is troubling him.
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Can you explain ________ the sun goes down in the west?
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 It was at the railway station         we first met 16 years ago.
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When was it ______ you met Yao Ming in the street?
#85438
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