题目内容

I want to be a volunteer some day. I feel _____ is my duty to help others.
A．thisB．thatC．themD．it
D

试题分析：考查it做形式主语。It是形式主语，真正的主语是不定式to help others.句意：我想有一天我也去做志愿者。我感觉到帮助别人是我们的职责。根据句意说明D正确。
点评：在英语中能做形式主语和形式宾语的只有it，本题It是形式主语，真正的主语是不定式to help others.
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