【单选题】【消耗次数：1】
Computer software _____ some 70 percent of our range of products.
①
picks up
②
focuses on
③
accounts for
④
is based on
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①
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①
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Hetriedhisbesttofinish the work,_______difficultitwas.
①
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③
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Lily forgot_______a letter to her sister, so she wrote to her just now.
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