问题补充：
You have a big mouth, Li Fei. You have told everybody the secret.
A. can
B. mustn
C. shouldn
D. mightn
答案：
A. can
B. mustn
(答案→)C. shouldn
D. mightn
解析：考查情态动词用法。Shouldn’t have done本不应该做某事实际上却做了。句意：你真是大嘴巴，你本不应该被这个秘密告诉每个人的。故C正确。
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