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----______has Tom been a doctor ?       -----Since two years ago.
#32641
A
How soon
B
How much
C
How many
D
How long
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I am an_________ boy 
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Chinese
B
Japanese
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American
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Brazilian
–Yao Ming isn’t ________ overnight success. --I agree with you.
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an
B
a
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the
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Teaching is _________ interesting work.
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a
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an
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Yang Lei had ______ unusual experience in Gansu Province. ______ experiencechanged her life.
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a, The
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an, The
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---Lin Too, open _______door, please. ---I’ m coming, Mum.
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the
B
an
C
a
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