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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