I（）tell her the truthA,cannot helpB,cannot butC,had to helpD,couldn't help为什么要选B啊，but 在这有什么含意！！
參考答案:用排除法就可以了,这里but的含意是 used to show that everything else is impossible except the thing you are saying只有,除....之外别无可能,例如,what could he do but forgive her.