(d) is grammatically possible but semantically unlikely. It is possible that someone might make use of "papers" in Longman sense 7 as reference when writing a report. However, it is strange that they would "use" them in such a way that they would "have to buy some more".
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sb700121. To me the above test is difficult to recognize whether the word "paper" refers to number 1 or 7 of Oxford (1 or 7, 8, 9 of Longman). Is there any clue? I mean the word "paper" in my test can be countable and uncountable. Isn't it? Can option "d" be correct as well?It requires common sense for the student to determine what meaning of a word is