it is one's duty to do sth.其中______是形式主语,真正的主语是______.

问题描述:

it is one's duty to do sth.其中______是形式主语,真正的主语是______.
今天谁值日?
Who _____ _____ _____today?
保护地球是每个人的责任._____ _____ _____ _____protect the earth.
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因为不确定所以在这问一下

it to do sth
is on duty
It is everyone's duty to