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He has made another wonderful discovery, _____ I think is of great importance to science.   
#77865
A
which
B
what
C
when
D
that
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We are living in an age ______ we treasure very much, because it sees man’s rapid development.
#77626
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which
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when
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Bamboo grows best in the place _____ it is warm and rains often.
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The reason ____he was late was ____he had taken a wrong bus.
#75683
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why; because
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for; because
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________ I want to know, sir, is whether you have any goods in that bag _______ I should know about.
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What; what
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That; what
D
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I can think of many cases, ________students obviously knew a lot of English words and expressions but couldn’t write a good essay.  
#77264
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which
B
as
C
what
D
where