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(2013·甘肃兰州名校高三检测)The professor told me to start the research right now, ________ I was sure to fall behind.
A.orB.soC.butD.and
A
A 句意:教授让我立刻开始研究工作,否则我肯定会落后的。根据句意选用or,意为否则。
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