单项选择题
It is（）that he has to ask for help.
A.so a big job
B.a so big job
C.a such big job
D.such a big job
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A.so diligent
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Once he starts a job, he won't stop（）it is finished.
A.till
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D.until -
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（）you told me, I had heard nothing of what happened.
A.Not
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