I can think of many cases _______ students obviously knew a lot of English words and expressions but couldn’t write a good essay.
#72558
A
why
B
which
C
as
D
where
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Make marks _______ you have questions. 
#66894
A
which
B
in which
C
where
D
in where
   ______they have been working hard to find?
#70400
A
Is that what
B
Is that
C
It is that
D
Is it that