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　　1. My gandfather is used to getting up early. 解析：注意在固定词组be used to 中to是介词。

　　2. Hurry up, or you'llbelate.

　　3. We were preparing for the exam(s) (at) this time last week. 解析：考查过去进行时的用法。

　　4. She didn't leave her school until she worked out the problem. 解析：考查习惯用法not ---until---"直到---才----"。