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【单选题】
在sql语言中收回权限的操作是通过（ ）语句实现的。A.
Create
B.
Revoke
C.
Grant
D.
Insert
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举一反三
【单选题】Since the accident has happened,don’t be sad.It’s no use over the spilt milk. [ ]
A.
cry
B.
to cry
C.
crying
D.
having cried
【单选题】Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.
that; to eat
B.
whether; to be eaten
C.
that; to be eaten
D.
whether; to eat
【单选题】The girl________ to milk since last winter.
A.
learns
B.
learned
C.
has learned
D.
would learn
【单选题】Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe _____.
A.
that; to eat
B.
whether; to be eaten
C.
whether; to eat
D.
that; to be eaten
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