2. 外语
  3. A new material ______ , we have good reason to be optimistic.

A new material ______ , we have good reason to be optimistic.

admin2012-02-28  32
问题 A new material ______ , we have good reason to be optimistic.
选项 A、developed
B、being developed
C、was being developed
D、was developed
答案B
解析 本句话考查的是独立主格的用法。
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