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单项选择题

Techniques to employ the energy of the sun are being developed.

A．convert
B．store
C．use
D．receive
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热门试题

单项选择题A．proudB．friendlyC．luckyD．hopeful

A．proud
B．friendly
C．lucky
D．hopeful

单项选择题A．askedB．toldC．promisedD．allowed

A．asked
B．told
C．promised
D．allowed