题目内容：

高三的一道英语选择题,急啊
The teacher demanded that______ should John change his mind.
A. by no means B.no doubt
C.under no circumstances D.no way
答案为C.
我们知道by no means ,in no case 和 under no circumstance
都可以表示:决不,在任何条件下都不,为什么不选A?
谢谢啊
他们的区别:
by no means-----not at all
under no circumstance---never ,whatever happens
但是
我在一本词典上看见一个例句:
By no means could we tell him the truth.
我们决不能告诉他真相.
我的意思是在这个句子中不可以用A吗?