2. 外语
  3. Grace Airlines plans to spend $60 million_____seats on 2 of their medium and large-sized aircraft by the end of 2008.

Grace Airlines plans to spend $60 million_____seats on 2 of their medium and large-sized aircraft by the end of 2008.

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问题 Grace Airlines plans to spend $60 million_____seats on 2 of their medium and large-sized aircraft by the end of 2008.
选项 A、upgrade
B、to upgrade
C、upgrading
D、upgraded
答案C
解析 空格前的动词为spend，由“spend时间／金钱doing sth．”这样的结构可知应选择upgrading。
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