I didn’t understand his explanation. I asked him to repeat what he had said.

50/50

I didn’t understand his explanation because I asked him to repeat what he had said.

I didn’t understand his explanation, and I asked him to repeat what he had said.

I didn’t understand his explanation, for I asked him to repeat what he had said.

I didn’t understand his explanation, so I asked him to repeat what he had said.

Giải thích

Chọn đáp án D

"Tôi không hiểu lời giải thích của anh ấy. Tôi yêu cầu anh ta nhắc lại những gì anh ta đã nói."

- because: bởi vì

- for: vì

- and: và

- so: vì vậy, cho nên

“Tôi không hiểu lời giải thích của anh ấy nên tôi đã yêu cầu anh ấy nhắc lại những gì anh ấy đã nói.”