题目内容
11._______is our duty _______the earth well.( )| A. | This,protect | B. | This,protecting | C. | It,protect | D. | It,to protect |
分析 保护好地球是我们的职责.
解答 答案:D 根据"duty"和"…the earth"可知保护地球是职责,"…the earth"是真正的主语,那么前面需要形式主语it,根据"it is…to do sth"可知真正的主语前要加to,故选D.
点评 本题考查形式主语it的用法.常用句型有:It+be+adj./n.(for sb./of sb.)+to do sth.
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