2. 外语
  3. Dams are costly, but once they have been built, ______electricity very cheaply.

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

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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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