People have discovered a new source of energy

Question

People have discovered a new source of energy. A. A new source of energy has discovered. B. A new source of energy was discovered. C. A new source of energy have been discovered D. A new source of ene...

VietJack · Accepted Answer

Chọn đáp án D Giải thích: : Câu chủ động => bị động thời hiện tại hoàn thành với chủ ngữ số ít

People have discovered a new source of energy.

Nhà sách VIETJACK:

Although it rained heavily, they went on working.

We have no seats left for the concert next Sunday.

The storm blew a lot of trees down last night.

Cars cause pollution but people still want them.

He was very tired but he kept on working.

They have built a new hospital near the airport.

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