20．Mum，I arrived at the train station twenty minutes ago，but Betty          up yet．（　�。�
A．hadn't turnedB．won't turnC．hasn't turnedD．didn't turn

分析 媽媽，我20分鐘前就到達火車站了，但Betty還沒有露面．

解答 答案：C
根據(jù)句意可知，此處表示過去的狀態(tài)（20分鐘前我到達火車站時，Betty沒有露面這一狀態(tài)）持續(xù)到了現(xiàn)在；故用現(xiàn)在完成時；A．過去完成時表示過去某時間之前的動作或狀態(tài)；B．一般將來時，表示將來到動作或狀態(tài)；D．一般過去時指發(fā)生在過去的動作或狀態(tài)；因此A．B．D不合句意；故選C

點評 本題考查了現(xiàn)在完成時的用法．做本題時，首先應(yīng)根據(jù)句意，判斷空缺處的動作發(fā)生的時間以及所表達的意義；其次，應(yīng)注意區(qū)分現(xiàn)在完成時與過去完成時以及一般過去時的用法區(qū)別；因此，做類似的時態(tài)題時，需要熟練掌握各時態(tài)所表達的意義及用法．

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