题目内容
19.It is our duty ____ the environment.( )| A. | to protect | B. | protecting | C. | .protected | D. | .protect |
分析 保护环境是我们的职责.
解答 答案:A.根据It is our duty ____ the environment,可知这里考查了It is our duty to do sth,做某事是我们的职责.在这里it是形式主语,后面的to引导的不定式作真正的主语.故选A.
点评 本题考查了动词不定式的用法.解答时注意:It is our duty to do sth,做某事是我们的职责.
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