書名：新TOEIC必考單字600
頁數：p.311 Q16
題目：
Please check in with the receptionist when you arrive. If you were given a referral, please tell the receptionist the name of the doctor who ___________ you.
(A)will refer
(B)did refer
(C)refered
(D)refers
答案：C
疑問:
請問為何答案是選c不是b呢？