多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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单项选择题
A．He’’s unwilling to fetch the laundry.B．He has already picked up the laundry.C．He will go before the laundry is closed.D．He thinks his mother should get the clothes back.
A．He’’s unwilling to fetch the laundry.
B．He has already picked up the laundry.
C．He will go before the laundry is closed.
D．He thinks his mother should get the clothes back.
单项选择题
An operating system is no guarantee of online security probably because ______.
A．some OS suppliers are not trustworthy
B．it still fails to shield users from intrusions
C．antivirus software is not updated in due time
D．some terminals are not installed with such a system
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