英语单选You must explain ____________ how they succeeded _______
英语单选
You must explain ____________ how they succeeded _________ the experiment..
A.of us ,for
B.at us ,at
C.to us,in
D.for us,to
You must explain ____________ how they succeeded _________ the experiment..
A.of us ,for
B.at us ,at
C.to us,in
D.for us,to
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