whether it will do us good remains to be seen.帮我解释下,可以用whether吗?

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• it remains to be seen ____the new invention will do us a lot of good1.whether2.if3.thatwhy?后面做什么成分whether,为什么？引导主语从句放在后面不是也可以用IF
• whether it will do us good remains to be seen.帮我解释下,可以用whether吗?
• whether it will do us good remains to be seen.帮我解释下,可以用whether吗?
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• it remains (see) whether the agreements will be signed.