I am sorry to ______ (give) you so much trouble.have given动词不定式的完成式。动词不定式的完成式表示的

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问题 I am sorry to ______ (give) you so much trouble.

选项

答案 have given

解析动词不定式的完成式。动词不定式的完成式表示的动作发生在谓语动词表示的动作之前。结构为to have done或to have been done(被动式)。[例句] He seems to have caught a cold．他看上去感冒了。

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Theweather______(vary)fromdaytoday.varies句意：天气一天天变化。动词要用一般现在时第三人称单数。