6．I don't know whether you happen            it，but I am going to study in the UK for a year．（　�。�
A．hearB．to hearC．to be heardD．to have heard

分析 我不知道你是否碰巧已經(jīng)聽說這件事，但是我打算去英國學(xué)校一年．

解答 答案是D．本題考查不定式的完成式；題干中happen（碰巧）后面常常接動詞不定式，happen to do碰巧做…，故排除A；題干中沒有被動的含義，排除C；hear的動作已經(jīng)發(fā)生，故用"happen to have heard碰巧已經(jīng)聽說…"，故答案選D．

點(diǎn)評 首先判斷選項(xiàng)中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動詞的搭配．

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