（) they are doing has never been done before.

A、That

B、What

C、Whether

请帮忙给出正确答案和分析，谢谢！

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（)they are doing has never been done before.A. ThatB. WhatC. WhyD. Whether

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A．has beenB．has been doingC．has been doneD．has done

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A great deal has been done to remedy the

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Agreat deal has been done to remedy the si

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A great deal has been done to remedy the

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A great deal has been done to remedy the

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I should wish to die while still at work knowing that others will carry on what I can no longer do and content in the thought that what was possible has been done.

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