4．They put forward a proposal at the meeting        cutting down the high housing price．（　�。�
A．aims atB．aimed atC．to aim atD．aim at

分析 他們在會上提出一項建議，旨在降低居高不下的房價．

解答 答案：B 題干中cutting down the high housing price是作目的狀語，要用非謂語動詞；aim sth at…以…為目標(biāo)，proposal與aim之間構(gòu)成動賓關(guān)系，要用被動．故選B．

點評 過去分詞是非謂語動詞的一種，用法很靈活，分為簡單式done（表示與謂語同時或幾乎同時發(fā)生的動作）；完成式having been done（表示先于謂語的動作）．學(xué)習(xí)時，要把握其用法特征：表示被動和完成．同時還要注意區(qū)分現(xiàn)在分詞和不定式．

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