made us surprised that the students even didn't know the difference between the
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________ made us surprised that the students even didn't know ________ the difference between the two words lies.
A.What; where
B.It; where
C.That; where
D.It; what
试题答案
B
第一空用it作形式主语，真正主语是随后的that从句，此空不能用what；第二空用where引导宾语从句，引导词在从句中作状语。