The Internet connection was not stable. The teache...

Câu hỏi: The Internet connection was not stable. The teacher couldn't conduct the online lesson successfully.

A. Suppose that the Internet connection hadn't been stable, the teacher could conduct the online lesson successfully.

B. Without the stable Internet connection, the teacher could conduct the online lesson successfully.

C. If the Interet connection had been unstable, the teacher could have conducted the online lesson successfully.

D. But for the unstable Internet connection, the teacher could have conducted the online lesson successfully.