i don't know when_____famous A.does he become B.he becomes C.did he become D.he become答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不能加,陈述语序不能加助动词吗?

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idon''tknowwhen_____famousA.doeshebecomeB.hebecomesC.didhebecomeD.hebecome答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不

i don't know when_____famous A.does he become B.he becomes C.did he become D.he become答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不能加,陈述语序不能加助动词吗?
i don't know when_____famous A.does he become B.he becomes C.did he become D.he become
答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不能加,陈述语序不能加助动词吗?

i don't know when_____famous A.does he become B.he becomes C.did he become D.he become答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不能加,陈述语序不能加助动词吗?
B 根据选项的这种形式只能是he becomes或者he became