John is very ---if he promises to do something he’ll do it.
A. incredible
B. confidential
C. reliable
D. flexible
网友回答
A. incredible
B. confidential
(答案→)C. reliable
D. flexible
解析：考查形容词词义辨析。A难以置信的；B秘密的；C值得信赖的；D灵活的；句意：John是值得信赖的，如果他答应做某件事情，他会做的。根据句意说明C正确。