Lectures were so students could be more focused on their study for the finals.
A. called off
B. broken off
C. blown off
D. set off
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(答案→)A. called off
B. broken off
C. blown off
D. set off
解析：本题的含义是学校取消演讲，这样学生们就会把更多地精力花费在期末的学习上，call off表示取消的含义，故本题选A。