【題目】 My mother ______ English since she came to the city.

A. teaches B. has taught

C. taught D. have taught

【答案】B

【解析】

試題分析：句意：自從我的媽媽來這個城市，她就教英語。據(jù)since she came to the city，故句子用現(xiàn)在完成時，且主語my mother是第三人稱單數(shù)故用助動詞has，故選B。

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