D.then i came
only when i fully understood the poem放在句首时,主句倒装
但是only when i fully understood the poem被强调了之后,主句就不倒装了,因为,它不是在句首
D.then i came
only when i fully understood the poem放在句首时,主句倒装
但是only when i fully understood the poem被强调了之后,主句就不倒装了,因为,它不是在句首