6．So far，the students ____2，000 English words．（　�。�
A．learnB．learnedC．have learnedD．had learned

分析 到目前為止，學(xué)生們已經(jīng)學(xué)了2000個英語單詞了．

解答 答案：C
根據(jù)句中時間狀語為so far"到目前為止、迄今為止"強(qiáng)調(diào)過去發(fā)生的動作一直持續(xù)到現(xiàn)在，故確定謂語動詞用現(xiàn)在完成時，其結(jié)構(gòu)為have/has+過去分詞，根據(jù)主語為the  students 助動詞用have，learn的過去分詞為learned，故填have learned，故選C

點(diǎn)評 本題考查現(xiàn)在完成時態(tài)．判斷時態(tài)要找準(zhǔn)動作發(fā)生的時間，然后根據(jù)時態(tài)構(gòu)成選出正確的答案

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