3．Mr．Brown__________his hometown since he ____the army．（　�。�
A．has left；joinedB．has been away from；has joined
C．has been away from；joinedD．left；joined

分析 Brown先生自從他參軍以來就離開了家鄉(xiāng)．

解答 答案：C．
根據(jù)關(guān)鍵詞 since he ____the army可知，這里強(qiáng)調(diào)一種持續(xù)的狀態(tài)；所以本句使用現(xiàn)在完成時(shí)態(tài)，其構(gòu)成為：have/has+過去分詞，主語Mr．Brown是第三人稱單數(shù)形式，所以助動詞用has；其動詞要用延續(xù)性動詞be away，其過去分詞為been away，since在這里是自從…以來，它引導(dǎo)的從句應(yīng)該用一般過去時(shí)形式，join的過去式形式是joined，故選C．

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

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