题目内容
4.My teacher asks us _________ the environment because we only have one earth.( )| A. | to protect | B. | protecting | C. | protected | D. | protects |
分析 我的老师叫我们保护环境,因为我们只有一个地球.
解答 答案:A ask是动词,译为叫、要求、问,它的用法为ask sb to do sth,由此可知此题选A.B是现在分词,C是过去式或过去分词,D是动词第三人称单数形式,不符合此题语法.
点评 考常对动词惯用用法的掌握是解题关键.
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