---How old is your grandpa this year , Tom ?
--- ___________. And we are planning a party for his ________ birthday.

A．ninety ; ninety B．ninetieth ; ninetieth
C．ninety ; ninetieth D．ninety ; ninetieth

C

解析試題分析：句意：湯姆，你的爺爺今年多大年紀(jì)了？九十。我們?yōu)樗木攀畾q生日正籌劃晚會(huì)。ninety90歲，年齡用基數(shù)詞；his ninetieth birthday他的九十歲生日，要用序數(shù)詞。故選C。
考點(diǎn)：考查數(shù)詞。

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