Mr.Smith an imprtant part when he gave the lecture last Friday .
A. left out
B. picked out
C. let out
D. took out
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(答案→)A. left out
B. picked out
C. let out
D. took out
解析：这题考察词组辨析：left out遗漏， picked out挑选出， let out泄漏，took out拿出，句意是：斯密斯先生上星期五做讲座时遗漏了重要的部分。选A。