问题
选择题
| Since the world heritage list was first created in 1972, many more sites _____ it. |
| A. have added up to B. are added to C. have been added up to D. will be added up to |
答案
答案：C
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| Since the world heritage list was first created in 1972, many more sites _____ it. |
| A. have added up to B. are added to C. have been added up to D. will be added up to |
答案：C