[國中] My mom and dad are...

[twl (twl)]

昨天上課遇到一題

My mom and dad _____________________

其中有兩個答案..
A. are all dentists

B. are tall and thin

標準答案是A..
我當下也選A...

但我無法說出B哪裡不對...
請大家幫忙..

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推 sitifan:A is not correct. They are BOTH dentists.
推 zofloya:because B is not incorrect.
→ zexchun:a有問題,因為兩個人只能用"both",不能用all.我懷疑它怎麼
→ zexchun:會是正確答案.b是正常的,我不懂為甚麼它不是"標準"答案.
推 DANIELHSIANG:b才對吧
→ twl:謝謝大家.經過這樣說完之後我也覺得是B..有可能解答出錯了.