4．It has been proved_____eating vegetables in childhood helps to protect you against serious illnesses in later life．（　�。�
A．ifB．becauseC．whenD．that

分析 據(jù)證實(shí)，兒童時(shí)期吃蔬菜能夠幫助保護(hù)你在人生的后期抵抗疾�。�

解答 答案：D．
考查it的用法．題干中it是形式主語(yǔ)，真正的主語(yǔ)是后面的主語(yǔ)從句，根據(jù)意思可知該從句不缺少任何成分，故選that，if是否，because表原因，when當(dāng)從句中缺少時(shí)間狀語(yǔ)時(shí)才可用．

點(diǎn)評(píng) 本題考查it的用法．在主語(yǔ)從句中，當(dāng)主語(yǔ)從句很長(zhǎng)時(shí)，為了避免頭重腳輕，故將主語(yǔ)從句放到句子的后面，主語(yǔ)就有it代替作形式主語(yǔ)．

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