they discussed____they could settle the problem without others' help.为什么填whether 不能是if 呢?

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theydiscussed____theycouldsettletheproblemwithoutothers''help.为什么填whether不能是if呢?theydiscussed____they

they discussed____they could settle the problem without others' help.为什么填whether 不能是if 呢?
they discussed____they could settle the problem without others' help.
为什么填whether 不能是if 呢?

they discussed____they could settle the problem without others' help.为什么填whether 不能是if 呢?
名次性从句中在whether和if选你就选whether