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  3. That small country Aat one time Bmust be prosperous, Cfor it enjoyed Da high level of civilization.

That small country Aat one time Bmust be prosperous, Cfor it enjoyed Da high level of civilization.

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问题 That small country Aat one time Bmust be prosperous, Cfor it enjoyed Da 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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