10．It has been proved          taking exercise regularly does good to one's health．（　�。�
A．whetherB．whenC．whatD．that

分析 有規(guī)律的做鍛煉對(duì)人的健康有好處，這已經(jīng)被證實(shí)了．

解答 答案：D 根據(jù) It has been proved說(shuō)明it 是形式主語(yǔ)，而真正主語(yǔ)taking exercise regularly does good to one's health．有規(guī)律地做鍛煉對(duì)人的健康有好處已經(jīng)被證實(shí)了．可知句子完整，不缺成分，故選D．

點(diǎn)評(píng) 本題考查主語(yǔ)從句的連接詞，在充分分析it 形式主語(yǔ)的基礎(chǔ)上再結(jié)合語(yǔ)境便能選出正確答案．

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