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(dòng)詞的用法，can’t不能needn’t不必mustn’t不應(yīng)當(dāng)shouldn’t不應(yīng)該。句意是：你已經(jīng)盡力了，沒(méi)必要擔(dān)心考試。選B.
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