单选题 Every time he thought of the innocent people he killed in China, his ______ was troubled.

【正确答案】 C
【答案解析】conservation保守；consideration考虑；conscience良知；convenience方便。该句意思为“每当他想起自己在中国杀害的那些无辜的中国人，他的良心就倍受折磨”。