however和no matter how哪个不能放句首?

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• however和no matter how哪个不能放句首?
• This is a vary interesting book.I'll buy it,______.A.however much it mayThis is a vary interesting book.I'll buy it,______.A.however much it may cost B.no matter how it cost想请教一下老师为什么不能选B?A为什么可以?no matter和however后面的结构有区别吗?
• however和no matter how哪个不能放句首?
• ____,he often helps me with my studyA however he is busy D no matter how busy he is 麻烦问下 however不能放句首吗如果可以的话,no matter how busy he is要倒装吗
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