20．Look out!LooK at the traffic lights ____crossing the road．（　�。�
A．beforeB．afterC．since

分析 當(dāng)心！在過馬路之前看看交通燈．

解答 答案：A．
根據(jù)設(shè)空處前面的Look at the traffic lights．推測本句的句意是"當(dāng)心！在過馬路之前看看交通燈．"表示"在…以前"用介詞before，故選：A．

點(diǎn)評(píng) 把握句意和理解選項(xiàng)中介詞的意思是做好本題的關(guān)鍵．

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