问题
选择题
Tourism, _____ it brings in money to a country, can also result in damage to the World Heritage sites there. [ ]
A. because
B. as
C. while
D. since
答案
答案：C
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Tourism, _____ it brings in money to a country, can also result in damage to the World Heritage sites there. [ ]
A. because
B. as
C. while
D. since
答案：C