题目内容
He is the teacher by whom I ________ taught.
- A.have once been
- B.had once been
- C.have once
- D.had once
A
解析:
导解:teach动作发生在过去,且与主语I为动宾关系.
解析:
导解:teach动作发生在过去,且与主语I为动宾关系.
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