— Why is the librarian looking so hard at me?
— You ____ to read aloud in the reading room
A．don’t supposeB．haven’t supposedC．a(chǎn)re not supposedD．were not supposed
C
根據(jù)句子意思，應(yīng)選用be supposed to"應(yīng)該做……、被要求做……"，故排除選項(xiàng)A、B；分析上文情景，句中動(dòng)詞使用現(xiàn)在時(shí)形式，強(qiáng)調(diào)現(xiàn)在的狀態(tài)，所以，再排除選項(xiàng)D。
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