His sister left home in 1998, and _________ since then. 
A．hadnotbeenheardB．hasnotbeenheardof
C．hadnotheardofD．hasnotheardof
B

試題分析：考查時(shí)態(tài)：句意：他的妹妹在1998年離家，至今杳無(wú)音訊”。 And前用過(guò)去式表示她1998年離家這一事實(shí)，而and后用has not been heard of表示從1998到現(xiàn)在這一段時(shí)間的狀態(tài)。現(xiàn)在完成時(shí)表示過(guò)去發(fā)生并且已經(jīng)完成的動(dòng)作對(duì)現(xiàn)在造成影響或后果，而且his sister和hear of是被動(dòng)關(guān)系，選B。
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