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You have already tried your best, so you _____worry too much about the exams.
A．can’tB．needn’tC．mustn’tD．shouldn’t
B

這題考查情態(tài)動詞的用法，can’t不能needn’t不必mustn’t不應當shouldn’t不應該。句意是：你已經盡力了，沒必要擔心考試。選B.
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