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When I was at school, I _____ up very late, reading storybooks. 

A．used to stay B．was used to stay
C．used to staying D．is used to staying

A

解析試題分析：句意：當(dāng)我上學(xué)的時候，常常熬夜很晚看故事書。Used to do過去常常，be used to do被用來（不符合句意），be used to doing習(xí)慣做，應(yīng)該是was used to doing，所以選A。
考點(diǎn)：考查詞組辨析

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