单项选择题

It is known that solar power can ______ electric energy.

A．convert into
B．convert to
C．be converted into
D．be converted to
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单项选择题
I can't ______ what I am doing because it is so noisy here.
A．concentrate
B．concentrate in
C．concentrate on
D．concentrate about
单项选择题
Mary is always ______ with her neighbors, wherever she lives.
A．on good term
B．on good terms
C．in good term
D．in good terms
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