[题目]Mr. Smith English in our school since 2017.A.is teachingB.teachesC.will teachD.has taught 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Mr. Smith ______ English in our school since 2017.

A.is teachingB.teachesC.will teachD.has taught

【答案】D

【解析】

句意：史密斯先生自从2017年以来就在我们学校教英语。

考查现在完成时态。is teaching现在进行时态形式；teaches动词第三人称单数形式；will teach一般将来时态形式；has taught现在完成时态形式。根据since 2017，可知应该用现在完成时态。since 2017是现在完成时的标志词。现在完成时态表示过去发生或已经完成的动作对现在造成的影响或结果。或从过去已经开始，持续到现在的动作或状态。现在完成时态的构成：助动词have/has+过去分词，根据主语Mr．Smith，所以应该用has taught，故选D。

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