【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】

考查動詞時態(tài)。句意：他在 18 歲之前已經(jīng)自學高級英語課程。根據(jù)后文by the time可知應用完成時態(tài)，且“自學”發(fā)生在“turned”之前，即“過去的過去”故用過去完成時。故選 B。

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