There is one _______ thing we can be sure: _______ energy will be more challenging and more important in the future

Câu hỏi :

There is one _______ thing we can be sure: _______ energy will be more challenging and more important in the future.

A. the / Ø

B. the / an

C. a / the

D. Ø / Ø

* Đáp án

D

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