3．_______ the sight of the police officers，the thief ran off．（　�。�
A．InB．AtC．OnD．With

分析 一看到警察，那個(gè)小偷就跑了．

解答 答案：B．
at the sight of意為"一看到…"，為一個(gè)固定的介詞短語(yǔ)，其他的介詞都沒(méi)有這種搭配；故選B．

點(diǎn)評(píng) 有些介詞的使用是比較獨(dú)立的，記住即可．

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