John is very-if he promises to do something he’ll do it.A. incredibleB. confidentialC.

问题补充：

John is very ---if he promises to do something he’ll do it.

A. incredible

B. confidential

C. reliable

D. flexible

答案：

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。