17．      really makes a difference is people's attitude．（　�。�
A．ItB．WhichC．WhatD．That

分析 真正能夠造成影響的是人民的立場．

解答 答案：C 題干中really makes a difference是作主語的主語從句；從句缺少主語，要用連接代詞；which表達(dá)有范圍的選擇，意思是哪一個(gè)，句意沒有表達(dá)選擇．故選C．

點(diǎn)評 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句．根據(jù)它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句． 本題中what在主語從句中起連接作用，同時(shí)又充當(dāng)了從句的主語．

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