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 e

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>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。