2. 外语
  3. Not until the First World War ______ to improve the road system in the United States.

Not until the First World War ______ to improve the road system in the United States.

admin2004-12-29  126
问题 Not until the First World War ______ to improve the road system in the United States.
选项 A、a determined effort was made
B、made a determined effort
C、when a determined effort was made
D、was a determined effort made
答案D
解析
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