问题补充：
You can trust him because he always .
A. keeps his words
B. stick to his promise
C. keeps his word
D. keep his promise
答案：
A. keeps his words
B. stick to his promise
(答案→)C. keeps his word
D. keep his promise
解析：句意：你可以信任他因为他总是信守诺言。A. keeps his words；words 是消息；B. stick to his promise坚持承诺；C. keeps his word信守承诺；D. keep his promise保持诺言。故选C。
考点: 考查动词短语的用法。
