2. 专升本
  3. (2007) We are pleased that our power generation technology continues to play a key_____ in the country.

(2007) We are pleased that our power generation technology continues to play a key_____ in the country.

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问题 (2007) We are pleased that our power generation technology continues to play a key_____ in the country.
选项 A、role
B、instance
C、item
D、rule
答案A
解析
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