Now I come here at the of Mr.Smith to assist him finishing the work.A. requirementB. rema

问题补充：

Now I come here at the of Mr.Smith to assist him finishing the work.

A. requirement

B. remark

C. demand

D. request

答案：

A. requirement

B. remark

C. demand

(答案→)D. request

解析：A.requirement要求，B.remark评论，C.demand需求，D.request 要求，请求，这里主要是考查词组：at the request of sb.“应某人的要求/请求”，句意：现在我来这里是应斯密斯先生的请求帮助他完成工作的。所以选D。