If there were no automatic washing machines people would have to wash their clothes han

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。