Peter and his brother __________ to be vets.
(A)want(B)wants(C)wanting(D)
A"Peter and his brother"是兩個人，我們可以把它看成"they"，後面接動作want的時候，want不需要加s。(A)是正確答案。 注意want這個字的字尾不能加-ing。(C)是錯誤選項。