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外语
Dams are costly, but once they have been built, ______electricity very cheaply.
Dams are costly, but once they have been built, ______electricity very cheaply.
admin
2019-07-01
16
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.
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