[例]①More than a dozen students in that school ________ abroad to study medicine last year.
A. sent B. were sentC. had sentD. had been sent
[解析] 此题有明显的时间标志词last year,提示我们应该使用一般过去时;句中的主语students是被送的对象,应该使用被动语态?答案为B?
动词的时态一般都有其相应的时间状语,请同学们熟记下列8种常用时态所对应的时间状语?