单项选择题

The little boy had no choice but to look on _________as his mother was seriously injured in the traffic accident.

A．help
B．helpless
C．helpness
D．helplessly
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单项选择题
It makes no difference to me _____ Mr. Smith will come or not.
A．when
B．whether
C．that
D．how
单项选择题
_________writing a letter to the manager, he decided to talk to him in person.
A．Instead of
B．Because of
C．As for
D．Due to
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