题目

 Li Yang, the founder of Crazy English, says that he copies it down _______ he comes to a sentence. A. unless                  B. while                   C. because             D. every, time 答案：D某车间有工人56名，生产一种螺栓和螺母，每人每天平均能生产螺栓24个或螺母36个，应分配多少人生产螺栓，多少人生产螺母，才能使一个螺栓配2个螺母刚好配套？