20．-Why don't you go to the movie with me，Betty？
-Because I ______ it before．（　�。�
A．sawB．have seenC．see

分析 --Betty，你為什么不和我一起去看電影？--因為我以前看過了．

解答 答案：B 現(xiàn)在完成時態(tài)，表示過去發(fā)生的動作對現(xiàn)在造成的影響和結(jié)果．根據(jù)Why don't you go to the movie with me，Betty？結(jié)合句意，并根據(jù)時間狀語before，可知應(yīng)該用現(xiàn)在完成時態(tài)．現(xiàn)在完成時態(tài)的構(gòu)成：助動詞have/has+過去分詞，故選：B．

點評 本題主要考查動詞時態(tài)，做此類題目一定注意時間狀語，注意句子所表達(dá)的含義，才能更好地判斷．同時更應(yīng)記清時態(tài)的構(gòu)成形式．就本題而言，主要考查現(xiàn)在完成時態(tài)．

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