what color are they ? It's orange.爲什麼不說 they are orange?

題目：

what color are they ? It's orange.爲什麼不說 they are orange?
如題.請各位多指教.謝謝.

解答：

該句問的是顏色(color),而不是they,所以用「顏色」的代詞「it」來回答.當然從口語的角度上說,用「they're」來回答無傷大雅,未嘗不可,但是書面語就不可以了.