They no longer have to large numbers of temporary workers to do the harvesting.A. take on

问题补充：

They no longer have to large numbers of temporary workers to do the harvesting.

A. take on

B. hire on

C. work on

D. carry on

答案：

(答案→)A. take on

B. hire on

C. work on

D. carry on

解析：首先我们要知道这四个词组的意思take on呈现，雇佣，等意思根据句意可知应为雇佣，所以A正确；B.hire on看似符合句意，实际没有这种用法应将on 去掉；C.work on从事；D.carry on执行的意思，综上选A.