20.As can be judged from his expression,he is satisfied with the reply.

分析 從他的表情可以判斷出他對于回答很滿意.

解答 答案:As
解析:根據(jù)句意可知后面一個分句的內(nèi)容"他對回答很滿意"作前面一個句子的主語,而這兩個句子又是分開的,故不可用用It作形式主語;只能將其視作一個定語從句,用As作主句的主語,用來代指后面的整個句子.

點評 本題考查定語從句,做此類題目時要仔細(xì)分析句子的結(jié)構(gòu)確定句子的類型及所缺成分,再確定該由什么來充當(dāng)所缺成分.

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