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

解析本句话考查的是独立主格的用法。

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考博英语

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

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