[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] 此題有明顯的時間標志詞last year,提示我們應該使用一般過去時;句中的主語students是被送的對象,應該使用被動語態(tài)?答案為B?
動詞的時態(tài)一般都有其相應的時間狀語,請同學們熟記下列8種常用時態(tài)所對應的時間狀語?