Last Thursday Professor Wang had his ______ birthday.A、ninetyB、ninetieth’sC、ni

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问题 Last Thursday Professor Wang had his ______ birthday.

选项 A、ninety
B、ninetieth’s
C、ninties
D、ninetieth

答案 D

解析 表示“几岁的生日”要用序数词。答案为D。
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