单项选择题
She ought to stop work;she has a headache because she（）too long.
A.read
B.had read
C.is reading
D.has been reading
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A.ran over
B.ran into
C.ran through
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It is not easy to learn English well, but if you（） you will succeed in the end.
A.hang up
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The committee kept the results of the survey（）fearing a bad public reaction.
A.in itself
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C.by itself
D.of itself
