9．-You are so excellent．
-I don't understand what you mean      saying that．（　�。�
A．byB．forC．ofD．in

分析 --你是如此的優(yōu)秀．
--我不明白你這么說的意思是什么．

解答 答案：A．
by doing sth．"通過、憑借做某事"，根據(jù)句意"我不明白你這么說的意思是什么"可知，這里表達(dá)的是通過、憑借這么說的意思，by符合語境，for 為了…；of 表示所屬關(guān)系；in 在…的里面，故選A．

點評 本題考查介詞的詞義辨析．詞匯辨析題首先要掌握各個選項的詞義、固定搭配、用法，然后再根據(jù)句意，結(jié)合語境，選出正確答案．

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