John is very ——if he promises to do something he’ll do it .A. humourB. cautiousC. modestD.

问题补充：

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

A. humour

B. cautious

C. modest

D. reliable

答案：

A. humour

B. cautious

C. modest

(答案→)D. reliable

解析：本题考查动词。John 是可以信赖的——如果他答应做某事，他一定会做的。根据后句：如果他答应做某事，就会去做。据此可得出他是个可信赖的人。故选D。