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

A new material_____,we have good reason to be optimistic.

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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 本句话意为“我们有充分的理由保持乐观的态度，因为我们创造了一种新的材料。”本句话考查的是独立主格的用法。正确答案为B。
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