our opinions should___ factsa,base on b.be based on c.base upon d.ba based

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ouropinionsshould___factsa,baseonb.bebasedonc.baseupond.babasedouropinionsshould___factsa,baseonb.be

our opinions should___ factsa,base on b.be based on c.base upon d.ba based
our opinions should___ facts
a,base on b.be based on c.base upon d.ba based

our opinions should___ factsa,base on b.be based on c.base upon d.ba based
b.be based on
base on 词组,意思是以...为依据
这里要用被动语态

b

B,be based on,以。。。为依据,用被动语态