16．________ excited Geoff Marcy most was ________ there were planets in other solar system where life might exist．（　�。�
A．It； ifB．That； whetherC．What； whetherD．What； that

分析 使Geoff Marcy高興的是，在太陽系的其他的行星上有生命存在．

解答 答案D．
分析句子結(jié)構(gòu)可知，整個句子的謂語動詞為"was"，"was"之前為主語從句，之后為表語從句；主語從句中動詞"excited"之前缺少主語，又不指代人，因此應(yīng)該用連接代詞"What"；表語從句中不缺少主、賓、表等主要成分，意思已全面，因而應(yīng)該用連接詞"that"只起連接詞作用，無意義，故選D．

點評 本題考查名詞性從句．解答此類題目首先要讀懂句意和分析句子結(jié)構(gòu)，其次判斷是名詞性從句中的哪一種從句，然后再分析從句中的成分，如果從句中缺成分且不指代人時一般用what．

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