_______ that they refuse us, who else can we turn to for help?空格里填providing 还是suppose, 请解释原因?

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_______ that they refuse us, who else can we turn to for help?
空格里填providing 还是suppose, 请解释原因?

应该是Suppose,表示假设.
suppose可以放在句首.

当然填providing, providing, conj. 倘若,连接一个条件状语从句。
suppose 是动词,如果改成supposing也可以。

应该是supposing, 如果suppose后面没有ing, 我们也只能用providing.