Gina was both ____1999.She is old enough to go to school 选哪个

Gina was both ____1999.She is old enough to go to school 选哪个

题目
Gina was both ____1999.She is old enough to go to school 选哪个
选哪个
1 to
2 on
3 at
4 in
答案
4 in+年份
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