He is boy.A. a eight—years—oldB. an eight—year----oldC. an eight----years----old

问题补充：

He is boy.

A. a eight—years—old

B. an eight—year----old

C. an eight----years----old

答案：

解析：句意：他是一个八岁的男孩。“八岁的”作定语，要用eight—year—old形式，单词之间加连字符，year用单数形式；eight以元音音素开头，要用an。故选B。