单项选择题

Very few scientists ______ with completely new answers to the world's problems.

A．come to
B．come around
C．come up
D．come in
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单项选择题
Some people believe that giving gifts is one way ______ by others.
A．to love
B．love
C．to be loved
D．is loved
单项选择题
She may come with us ______ that she arrives in time.
A．in case
B．unless
C．if
D．provided
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