it remains________whether the patient can survive the major operation or not. a.to observe b.be...it remains________whether the patient can survive the major operation or not. a.to observe b.being observed c.observeing d.to be observed 选什么?

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it remains________whether the patient can survive the major operation or not. a.to observe b.be...it remains________whether the patient can survive the major operation or not. a.to observe b.being observed c.observeing d.to be observed 选什么?

it remains________whether the patient can survive the major operation or not. a.to observe b.be...it remains________whether the patient can survive the major operation or not. a.to observe b.being observed c.observeing d.to be observed 选什么?
it remains________whether the patient can survive the major operation or not. a.to observe b.be...
it remains________whether the patient can survive the major operation or not. a.to observe b.being observed c.observeing d.to be observed 选什么?为什么?要详解谢谢

it remains________whether the patient can survive the major operation or not. a.to observe b.be...it remains________whether the patient can survive the major operation or not. a.to observe b.being observed c.observeing d.to be observed 选什么?
to be observed it是形式主语,后面的从句是主语从句,表示这件事要被观察.所以选被动.

It It it It it it it it it Was it worth it? it help it help Belive it,do it It takes what it it is today.it It 宾格?还是it? Take it as it it burns,it does Got it、Heard it、Made it、Taken