Our teachers have been with us for nearly three years ____ we came to junior high school. We should

Our teachers have been with us for nearly three years ____ we came to junior high school. We should thank them for what they have done for us.

A. until B. before C. since D. while

【答案】

C

【解析】

句意：自从我们来到初中，我们的老师们已经和我们在一起将近三年了，我们应该感谢他们为我们所做的一切。本题考查连词词义辨析。A. until 直到···才 B. before 在···之前 C. since自从 D. while当···时候。这里是since引导的时间状语从句，主句用现在完成时态，从句用一般过去时态，其他不符合题意，故选C。