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With extra evidence John Snow was able to______(宣布) with certainty that polluted water carried the virus.
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In the 1950s, the Chinese government introduced ________(簡化)Chinese characters and now they are used widely in mainland China.
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But for your timely help,the boy his life.
A、will lose B、has surely lost C、might have lost D、shouldn’t have lost
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my hometown take on a new look, a sense of suddenly appeared in my mind.
A. Having seen; joy B. Seeing; happiness
C. While I saw; delight D. When I saw; pride
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In aerospace devices the weight of the necessary power producing equipment is _____.
A. vital B. possible C. capable D. reliable
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They may go swimming with us ____________ they arrive here in time.
A. provided B. because C. unless D. even if
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When I met my friend, he asked me _____ I was getting along well with my new job.
A. that B. how C. whether D. what
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Eliza remembers everything exactly as if it ______ yesterday.
A. was happening B. happens C. has happened D. happened
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Joseph ______to evening classes since last month, but he still can’t say “What’s your name?” in Russian.
A. has been going B. went C. goes D. has gone
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Selecting a mobile phone for personal use is no easy task because technology _______ so rapidly.
A. is changing B. has changed C. will have changed D. will change
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