单项选择题
His chief difficulty（）people ignorant of Jeans machinations.
A.lie in keeping
B.lies in keeping
C.lay in keeping
D.lay at keeping
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A.Whoever
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C.Whenever
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The students and graduates（）to raise money when the gym burned down.
A.put in force
B.joined forces
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I am sure you’d be the first to be sorry if anything was to（）him.
A.happen on
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C.happened to
D.happen upon
