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"Oh,I'm not feeling well in the stomach,I ________ so much f

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"Oh,I'm not feeling well in the stomach,I ________ so much fried chicken just n"
"Oh,I'm not feeling well in the stomach,I ________ so much fried chicken just now.
A.shouldn't eat
B.mustn't have eaten
C.shouldn't have eaten
D.mustn't eat"
答案C
由just now而知,本题谈论过去之事.谈论过去之事,在should或must之后接不定式的完成式.must表示推测只用于肯定句中,shouldn’t have done表说话之前本不应该做某事,但事实上却做了,含有责备的口气.