19.-Look!Mr.Brown is over there.
--It can't be him.He________ away since last Sunday.( 。
A.wasB.has beenC.wereD.will be

分析 --看!Brown先生在那邊.
--不可能是他.自從上個(gè)星期天以來(lái)他就離開(kāi)了.

解答 答案:B.
根據(jù)since last Sunday可知,"自上個(gè)星期天"表示一段時(shí)間,表示過(guò)去的動(dòng)作一直持續(xù)到現(xiàn)在,應(yīng)該用現(xiàn)在完成時(shí)態(tài);現(xiàn)在完成時(shí)態(tài)的結(jié)構(gòu)為have/has+動(dòng)詞的過(guò)去分詞,在這里用延續(xù)性動(dòng)詞be,表狀態(tài).故選B.

點(diǎn)評(píng) 判斷動(dòng)詞的時(shí)態(tài),要通過(guò)所給的時(shí)間狀語(yǔ)、提示詞或語(yǔ)境去判斷動(dòng)詞存在的狀態(tài).注意容易混的動(dòng)詞的用法.

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