____ is our belief that improvements in health care will lead to a stronger, more prosperous economy.
A．AsB．ThatC．ThisD．It
D

試題分析：句意：那是我們的信念醫(yī)療保健的進步將促進一個更強大,更繁榮的經(jīng)濟。這里是that引導(dǎo)的是主語從句，它在從句中不作成分，it是形式主語，代替真正的that引導(dǎo)的主語從句。故選D。
點評：本題難度適中。代詞是高中階段要求掌握的語法項目，尤其是it的用法多，并且還是高考�？嫉闹R點，需要考生在平時反復(fù)的練習(xí)中鞏固掌握它的用法。
即學(xué)即練：____ was known to us all that Johnson had broken his promise____ he would give each of us a small gift.
A. As; which       B. What; that         C. It; that     D. It; which
解析：C。It為形式主語，代替真正的主語從句that Johnson had broken his promise ...；that引導(dǎo)同位語從句，解釋promise的具體內(nèi)容。
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