Dams are costly, but once they have been built, ______electricity very cheaply.A

游客2025-02-04 1

问题 Dams are costly, but once they have been built, ______electricity very cheaply.

选项 A、producing
B、they produce
C、production of
D、and produce

答案 B

解析 The third clause needs a subject and a verb: they produce.

转载请注明原文地址:https://tihaiku.com/zcyy/3942541.html

相关试题推荐

随机试题

最新回复(0)

Damsarecostly,butoncetheyhavebeenbuilt,______electricityverycheaply.A