2. 外语
  3. More and more advanced farm machines ______, the agricultural production increased tremendously.

More and more advanced farm machines ______, the agricultural production increased tremendously.

admin2010-02-22  63
问题 More and more advanced farm machines ______, the agricultural production increased tremendously.
选项 A、using
B、having used
C、having been used
D、to have been used
答案C
解析
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