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  3. That small country A at one time B must be prosperous, C for it enjoyed D a high level of civilization.

That small country A at one time B must be prosperous, C for it enjoyed D a high level of civilization.

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问题 That small country A at one time B must be prosperous, C for it enjoyed D a high level of civilization.
选项 A、 
B、 
C、 
D、 
答案B
解析 应改为must have been，表示对过去的肯定推测，故用“must+have done”的形式。
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