问题补充:
If there were no automatic washing machines, people would have to wash their clothes hand or hand-operated machines.
A. by; by
B. with; with
C. on; with
D. by; with
答案:
A. by; by
B. with; with
C. on; with
(答案→)D. by; with
解析:考察介词搭配。固定搭配by hand用手;手工制作;with machine用机器。句意:如果没有自动化洗衣机,人们就不得不用手或者用手操作的机器来洗衣服。故D正确。