Which of the italicized parts functions as a subject？（2012)A．We never doubt that her broth
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Which of the italicized parts functions as a subject？(2012)
A．We never doubt that her brother is honest.
B．The problem is not who will go but who will stay.
C．You must give it back to whoever it belongs to.
D．It is clear that the crime was done deliberately.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
2012年第57题。A项that-从句为及物动词doubt后的宾语从句；B项为系动词be后的表语从句；C项为介词to后的宾语从句；只有D项为主语从句，it为形式主语。