单项选择题

Mom used to be very busy at that time and had to put me ______ the care of my grandma.

A．for
B．at
C．on
D．in
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单项选择题
Since our research so far has not produced any answers to this problem, we need adopt a different ______ to it.
A．approach
B．way
C．means
D．method
单项选择题
She refused to tell us the ______ of the news although we insisted that she should.
A．source
B．beginning
C．birth
D．origin
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