5. China has made great progress in the sun’s rays as a source of energy.A. harnessB. harn

问题补充：

5. China has made great progress in the sun’s rays as a source of energy.

A. harness

B. harnessing

C. harvest

D. harvesting

答案：

A. harness

(答案→)B. harnessing

C. harvest

D. harvesting

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