单项选择题

______ it will do us harm or good remains to be seen.

A．Whether
B．If
C．As
D．All
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单项选择题
______ what to do, he went to the old man for help.
A．Not knowing
B．Not know
C．Not to know
D．Not known
单项选择题
The managing director took the ______ for the accident, although it was not really his fault.
A．guilt
B．blame
C．accusation
D．charge
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