题目内容：
The American space program has once again __________ even its most optimistic proponents: it did not expand as rapidly in the third quarter, at least to the extent that most had __________.
参考答案：
答案解析：
单选题：The American space program has once again __________ even it
- 题目分类：GRE
- 题目类型：单选题
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