問題詳情：
![---Lucy,howoldisyourgrandmotherthisyear?.---]( "---Lucy,howoldisyourgrandmotherthisyear?.---")
--- Lucy, how old is your grandmother this year?.
--- ______. And we are planning to have a birthday party for his ______ birthday this Saturday.
A. Ninety; ninetieth B. Ninety ; the ninetieth
C. Ninty , the ninetieth ty ; nintieth
【回答】
A
知識點：數詞
題型：選擇題
