_ Frank solved the problem is not clear to us.A.If B.That C.How D.What

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_ Frank solved the problem is not clear to us.A.If B.That C.How D.What
_ Frank solved the problem is not clear to us.A.If B.That C.How D.What

_ Frank solved the problem is not clear to us.A.If B.That C.How D.What
C
is 前是主语从句,how Frank 是怎样解决问题的,我们还不清楚.
if 不能引导主语从句,可以用whether,
不缺成分,所以不能用that.what

C

B Frank如何解决问题的,我们并不清楚
A if不能引导主语从句,改成whether即可。

选择C,
How引导主语从句是How Frank solved the problem
意思是:Frank 是怎么解决这个问题的我们还不怎么清楚。
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