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我现在胃不舒服,一定是刚才鸡肉吃得太多了。( must have done )
I am not feeling well in the stomach. I must have eaten too much chicken just now.
考查must对过去的肯定推测。must表示肯定的推测,如果对过去的推测用must have done,现在及将来的推测用must do。同时注意否定和疑问的推测常常用can。
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