Prof. Smith______ forty or so when I first met him at the International Peace Co

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问题 Prof. Smith______ forty or so when I first met him at the International Peace Conference in Geneva.

选项 A、must be
B、had been
C、must have been
D、could be

答案 C

解析本题中有明确的过去时间状语“when I first met him我第次遇见他”。句中的前面是对史密斯教授年龄的推测，表示对过去的肯定猜测应用must have been，C项符合题意。

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