17．It is difficult            a best friend．（　�。�
A．to findB．findingC．findD．to be found

分析 找最好的朋友很難．

解答 答案是A．本題考查動(dòng)詞不定式做狀語．英語中做表語和補(bǔ)語的形容詞后往往接動(dòng)詞不定式做狀語，并且用主動(dòng)形式表示被動(dòng)的含義；故本句中做表語的形容詞difficult后面需要的是動(dòng)詞不定式to find，答案是 A．

點(diǎn)評(píng) 先判斷選項(xiàng)中的動(dòng)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(dòng)詞的搭配．

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