1.They are ____A.growns-up B.grown-ups C.grown-up D.growns-ups此题答案是B，为什么不能选C。2.Li Ying his three ____。A.brothers-in-law B.brothers-in-laws C.brother-in-law D.brother-in-laws此题答案是A，为什么不能选C。
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前有are，three是复数
1.They are ____A.growns-up B.grown-ups C.grown-up D.growns-ups此题答案是B，为什么不能选C。2.Li Ying his three ____。A.brothers-in-law B.brothers-in-laws C.brother-in-law D.brother-in-laws此题答案是A，为什么不能选C。
前有are，three是复数