15．The new online library makes        possible for students to choose books by smart phone off campus．（　�。�
A．itB．oneC．thatD．this

分析 新的網(wǎng)上圖書館使學生離開校園通過智能手機選擇圖書成為可能．

解答 答案選A．
這里使用了句型"make it+adj．+for sb．to do sth．"，意思是"做…事情對某人來說是…"，這里的it是形式賓語，to choose books by smart phone off campus是真正的賓語，其他三個選項都不能做形式賓語，故選A

點評 it在句中可以做形式主語或形式賓語，真正的主語或賓語通常為動詞不定式或that從句或動名詞．
例如：It is not right to use these places as rubbish dumps．把這些地方用來倒垃圾是不對的．（it用作形式主語，真正的主語為動詞不定式）
      It was clear that they had no desire for peace．很清楚他們沒有和平的誠意．（it用作形式主語，真正的主語為that從句）
      Do you consider it any good trying again？你覺得再試會有好處嗎？（it用作形式賓語，真正的賓語為動名詞）

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