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It has been 4 years _____ the earthquake happened in Wenchuan
#57983
A
when
B
since
C
after
D
while
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You will achieve nothing        you work hard.
#55257
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if
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You have coughed for several days, Bill. Stop smoking,________ you’ll get better soon.
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#55506
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#58372
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both
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neither
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