It’s hard to finish the work in a day. You’d better your friends to help you.A. call forB

问题补充：

It’s hard to finish the work in a day. You’d better your friends to help you.

A. call for

B. call on

C. call at

D. call up

答案：

A. call for

(答案→)B. call on

C. call at

D. call up

解析：可联系答.案.网客服索取。