题目内容

-How was your day off yesterday?
-Perfect! It was ____ birthday of my grandpa’s . We had a big family celebration.
A. seventy    B. seventieth    C. the seventieth 
C解析:
考查序数词。我爷爷七十岁的生日,“七十”要用序数词形式,在表述时前面加”the”
表示“第七十”的意思。
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