12．Though it was dangerous      Tom to save the baby from the fire，it was really brave    
him to do so．（　�。�
A．of；ofB．of；forC．for：forD．for：of

分析 雖然對湯姆來說從火中救那個嬰兒很危險，但是他那樣做真的很勇敢．

解答 答案：D．
句意是"雖然對湯姆來說從火中救那個嬰兒很危險，但是他那樣做真的很勇敢．"第一個設(shè)空處前面的形容詞是dangerous一般用來修飾事物，所以用句式：It's+adj．+for sb．+不定式，第二個設(shè)空處前面的形容詞是brave，用來表示人的品德，所以用句式："It's+adj．+of sb．+不定式"故選D

點評 該題考查的是介詞的區(qū)別，考點較細(xì)，It's+adj．+of+sb．+不定式和It's+adj．+for+sb．+不定式的區(qū)別比較抽象，應(yīng)該仔細(xì)加以區(qū)別．

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