5．Mary has been waiting days for George to make a call，but up to now he           ．（　�。�
A．didn'tB．hadn'tC．won'tD．hasn't

分析 瑪麗等喬治打電話來已經(jīng)等了好幾天了，但是直到現(xiàn)在他仍然沒有打來．

解答 答案：D．
考查現(xiàn)在完成時．題干中前一個分句的謂語動詞是現(xiàn)在完成時，第二個分句的時間狀語是up to now直到現(xiàn)在，可知用現(xiàn)在完成時，強調(diào)對現(xiàn)在造成的影響，A一般過去時，B過去完成時，C一般將來時，D現(xiàn)在完成時，所以選D．

點評 本題考查現(xiàn)在完成時的用法．
現(xiàn)在完成時表示過去發(fā)生或已經(jīng)完成的動作對現(xiàn)在所造成的影響或結(jié)果，也可以表示從過去已經(jīng)開始一直持續(xù)到現(xiàn)在的動作或狀態(tài)．其形式是have/has+done．

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