问题描述：
●●●●●一道英语选择题18●●●●●18
The old man has two _____.
A.son-in-law B.sons-in-law C.son-in-laws D.sons-in-laws
The old man has two _____.
A.son-in-law B.sons-in-law C.son-in-laws D.sons-in-laws
问题解答：
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