We have heard of many cases _______ some citizens ，especially some famous people， have suffered because personal information had been leaked.
#4968
A
why
B
which
C
as
D
where
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________ you understand the rule, you’ll find English easy to learn.
#4634
A
As
B
While
C
Once
D
Whether
Mike’s father, as well as his mother, commanded that he _____ home.
#4565
A
stayed
B
could stay
C
stay
D
has stayed