题目内容
17.I began watching here an hour ago,but now nothing ________ yet.( )| A. | happens | B. | will happen | C. | happened | D. | has happened |
分析 翻译:一小时前我开始观察这里,但是现在任何事还没有发生.
解答 答案:D.因为句中有yet,所以该用现在完成时,现在完成时构成为:主语+have/has+动词的过去现在分词+其他成分,句中的主语是nothing,nothing是不定代词,该用has,故该用 has happened,故选D.
点评 本题考查的是现在完成时,表示过去发生动作对现在现在造成的影响或结果.
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