8．____ is clear that this kind of work can help people．（　�。�
A．ThisB．ThatC．ItD．What

分析 很明顯的是這種工作能幫助人們．

解答 答案：C
解析：分析句子結(jié)構(gòu)可知that前面的句子缺少主語，又根據(jù)句意可知that后面的句子的內(nèi)容作前面句子的主語；由此可知本題考查"it作形式主語，that引導(dǎo)的主語從句作真正主語"這一用法，故本題答案為C選項(xiàng)．

點(diǎn)評(píng) 本題考查It的用法，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，根據(jù)句意及語法確定句子所缺成分，再結(jié)合所給選項(xiàng)選出正確答案．

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