问题补充：
As Polly observed the passengers on the train, she that she was being watched by a tall man in a dark coat.
A. feared
B. sensed
C. sighted
D. sniffed
答案：
A. feared
(答案→)B. sensed
C. sighted
D. sniffed
解析：考查动词辨析：A. feared害怕B. sensed感觉C. sighted看见D. sniffed嗅，闻，句意：当Polly观察火车上的人，他感觉到她被一个穿着深色外套的人注视着。选B。
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