--Peter, how old is your father this year?--________. And we just had a party for his ________ birthday last weekend.A.Fortieth; fortyB.Forty; fortyC.Forty; fortiethD.Fortieth; fortieth
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C解析解析：考查基数词和序数词。上句为：彼得，你父亲今年多少岁了?下句为：四十岁。上周末我们刚为他过完四十岁生日。表示年龄用基数词----forty，表示第几个生日用序数词----fortieth。