【題目】He_________himself advanced English all by himself by the time he turned 18.

A.taughtB.had taughtC.has taughtD.would teach

【答案】B

【解析】

考查動(dòng)詞時(shí)態(tài)。句意：他在 18 歲之前已經(jīng)自學(xué)高級(jí)英語(yǔ)課程。根據(jù)后文by the time可知應(yīng)用完成時(shí)態(tài)，且“自學(xué)”發(fā)生在“turned”之前，即“過(guò)去的過(guò)去”故用過(guò)去完成時(shí)。故選 B。

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