He was ______ by the noise outside yesterday evening and could not concentrate on his study.

【正确答案】 C

【答案解析】 动词词义辨析。句中提及“噪音”“不能专心学习”，选项中perturb“使烦躁不安”符合语境，表示“因为噪音而心烦意乱”。peck“啄食”，orient“导向”和paddle“划桨，搅拌”均不符合句意。故答案为C。