He raised his voice we still couldn’t hear anything．A. soB. orC. butD. as

问题补充：

He raised his voice, we still couldn’t hear anything．

A. so

B. or

C. but

D. as

答案：

A. so

B. or

(答案→)C. but

D. as

解析：词义辨析题。 A．so 因此 B．or否则C．but但是 D．as 因为句意：他提高了嗓音但是我们还是听不见他的声音。根据语境前后两句为转折关系故选C