单项选择；从A、B、C、D四个选项中选出最佳选项。—Howoldisyourson?—
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问题详情：
单项选择；从A、B、C、D四个选项中选出最佳选项。
—How old is your son?
—_________. We had a special party for his _________ birthday yesterday.
A , nine B. Ninth, nine C. Nine, the ninth D. Nine, ninth
【回答】
D
知识点：数词
题型：选择题
