Techniques to {{U}}employ{{/U}} the energy of the sun are being developed.

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:14:05 免费下载:《单选题》Word试卷

Techniques to {{U}}employ{{/U}} the energy of the sun are being developed.
A.convert
B.store
C.utilize
D.receive

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