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

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

【答案】D

【解析】

句意：史密斯先生自從2017年以來就在我們學(xué)校教英語。

考查現(xiàn)在完成時(shí)態(tài)。is teaching現(xiàn)在進(jìn)行時(shí)態(tài)形式；teaches動詞第三人稱單數(shù)形式；will teach一般將來時(shí)態(tài)形式；has taught現(xiàn)在完成時(shí)態(tài)形式。根據(jù)since 2017，可知應(yīng)該用現(xiàn)在完成時(shí)態(tài)。since 2017是現(xiàn)在完成時(shí)的標(biāo)志詞�，F(xiàn)在完成時(shí)態(tài)表示過去發(fā)生或已經(jīng)完成的動作對現(xiàn)在造成的影響或結(jié)果�；驈倪^去已經(jīng)開始，持續(xù)到現(xiàn)在的動作或狀態(tài)�，F(xiàn)在完成時(shí)態(tài)的構(gòu)成：助動詞have/has+過去分詞，根據(jù)主語Mr．Smith，所以應(yīng)該用has taught，故選D。

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