Thousands of protesters () major roads in the central business area of the city for weeks, leading to much inconvenience for many Hong Kong citizens. ( 章节：3 难度：1)_做题室

单项选择题Thousands of protesters () major roads in the central business area of the city for weeks, leading to much inconvenience for many Hong Kong citizens. ( 章节：3 难度：1): A、knocked off; B、blocked off; C、knocked out; D、blocked out

正确答案：B
答案解析：
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