BJS10109002    both   

2013/06/21 15:47

老師您好:

Amy: My sister and her husband are coming over for dinner tomorrow. It's my sister's birthday, so I have to prepare her favorite food.
Nora: who else is coming to dinner?
Amy: Rick and Lina. They........ my sister's classmates in juniour high school.

(          ) (A) all are   (B) both are (C)were all (D)were both    

這題答案是(B), 但是我覺得應該是(D), 因為Rick and Lina 是她姐姐上國中時的同學? 對嗎?
另外想問一下,
1. They are both my friends.
2. They both are my friends
1.2 句中的both 詞性各是什麼, 兩句有什麼不同? All 的用法和both 一樣嗎?

謝謝！