单选题
The man-hunt would have been unsuccessful ________.
A、
if the detectives hadn't questioned so many people in Atlanta and in Los Angeles
B、
if it detectives hadn't watched railway stations, hotels and airports
C、
if it hadn't been for the help of the Canadian police
D、
if the murderer hadn't worn thick glasses
【正确答案】
C
【答案解析】
[解析] 文章提到加拿大警方也在协助调查，而且提供了重要线索。故本题答案为C。
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