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1.___is known to everyone , we all have to pass Level B test

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1.___is known to everyone , we all have to pass Level B test to get a certificate.
a.which b.that c.it d.as
2.___leaves the room last should check if the windows are closed and lights are turned off.
a.anyone b.the one c.who d.whoever
3.It won't make much ___whether the meeting is held or not.
a.different b.difference c.differences d.differently
最好可以稍带些解释,十分感谢!
1.___is known to everyone , we all have to pass Level B test
1._D__is known to everyone ,we all have to pass Level B test to get a certificate.
a.which b.that c.it d.as
备注:as引导非限制性定语从句,指代主句
众所周知,我们只有通过B级考试才能拿到毕业证书.
2.__D_leaves the room last should check if the windows are closed and lights are turned off.
a.anyone b.the one c.who d.whoever
备注:whoever 引导主语从句
最后离开房间的人需要检查窗户是否关闭,灯是否关了.
3.It won't make much _B__whether the meeting is held or not.
a.different b.difference c.differences d.differently 备注:make much difference 产生很大的差异 .
whether 在此处引导主语从句,it是形式主语.