________ is mentioned(提及) above, the number of the students in senior high schools is increasing.
#78524
A
Which
B
It
C
What
D
As
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I can think of many cases ______students obviously know a lot of English words and expressions but couldn’t write a good essay .
#77369
A
why
B
which
C
as
D
where
_____ in the library regulations that any book borrowed be returned by due time, or the borrower will be fined．
#78012
A
What is required
B
It is required
C
As is required
D
Which is required