(2013·甘肅蘭州名校高三檢測)The professor told me to start the research right now, ________ I was sure to fall behind.
A．orB．soC．butD．a(chǎn)nd
A
A　句意：教授讓我立刻開始研究工作，否則我肯定會落后的。根據(jù)句意選用or，意為否則。
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