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选a语义上说的通, 但that指代前面的countries感觉不好
Personally, I think the first question should choose A as anwer .Even though B is grammarically correct but is logically flawed (逻辑上不合理),应该是 a tour involves ... not Hu ...
I think the first should choose A .That 指代的应是 A TOUR 不是 COUNTRIES.
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