He was about to do his homework when an unusual noise his attention.A. arrestedB. affecte

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(答案→)A. arrested
B. affected
C. attacked
D. attended
解析：A. arrested逮捕，B. affected影响，C. attacked袭击，D. attended参加，arrest one’s attention吸引某人的注意力，句意：他刚要做作业，这时一个不寻常的声音吸引了他的注意力。选A。