Question

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

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

Answer 1

【答案】B

【解析】

考查动词时态。句意：他在 18 岁之前已经自学高级英语课程。根据后文by the time可知应用完成时态，且“自学”发生在“turned”之前，即“过去的过去”故用过去完成时。故选 B。