作业帮my sister could swim__________the age of ten A on B of C at D in
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my sister could swim__________the age of ten A on B of C at D in
my sister could swim__________the age of ten A on B of C at D in
my sister could swim__________the age of ten A on B of C at D in
C
at the age of ten = When she was ten years old.10岁时
不明白的再问哟,请及时采纳,多谢!
c
at the age of
c 在什么的年纪
选C age表年龄的词就是和at 连用的
选C at
at the age of……在（多大）的时候