i don't know when-----famous A.does he become B.he becomes C

B 根据选项的这种形式只能是he becomes或者he became 再问： C中助动词为什么不能加，陈述语序不能加助动词吗？ 再答： 要表达过去做过，直接用he became，不要在前面加did，否则就不是陈述语序了。陈述语序要加did的情况只有否定的时候。比如：I want to know why he didn't come。