(A) Because of the expense of (B) traditional fuels and the concern that they (C) run out, many countries have been (D) investigating alternative source...

Câu hỏi :

(A) Because of the expense of (B) traditional fuels and the concern that they (C) run out, many countries have been (D) investigating alternative sources of power

A Because of

B traditional fuels

C run out

D investigating

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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