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(dá)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(dá)火車站時(shí)，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(shí)；A．過去完成時(shí)表示過去某時(shí)間之前的動(dòng)作或狀態(tài)；B．一般將來時(shí)，表示將來到動(dòng)作或狀態(tài)；D．一般過去時(shí)指發(fā)生在過去的動(dòng)作或狀態(tài)；因此A．B．D不合句意；故選C

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

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