问题
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Although he had looked through all the reference
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______all the references to verify the information.A.Look byB.Look outC.Look upD.Look to
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______harder, he would have got through the exams.A.Had he workedB.He had workedC.Should h
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He finally______ to find the reference book that he had been looking for.A.triedB.attempte
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Looking at all he had achieved, he couldn ’t help weeping.A、whatB、whichC、asD、that
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Although he had looked through all the reference material on the subject he still