2. 外语
  3. He ______ ten lectures on African literature, but he only gave three because of his illness.

He ______ ten lectures on African literature, but he only gave three because of his illness.

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问题 He ______ ten lectures on African literature, but he only gave three because of his illness.
选项 A、must have given
B、should have given
C、gave
D、had given
答案B
解析 由该句下半句的but可以看出，上半句应该是没有发生的事情，所以采用虚拟语气，should have done表示应该做而没有做的事情，带有轻微的指责，符合语法和句子含义。
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