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求教一道sat语法题~whentheberlinwall,longthesymbolofthecoldwarbegantobetorndownin1989,fivemillionofpeoplewenttoberlintocelebratethat.a.tocelebratethatb.tocelebrate为什么选b不选a呢?

题目详情
求教一道sat语法题~
when the berlin wall,long the symbol of the cold war began to be torn down in 1989,five million of people went to berlin to celebrate that.
a.to celebrate that
b.to celebrate
为什么选b不选a呢?
▼优质解答
答案和解析
前面已经提及了,后面就不用再用that指代了