請問這句話為什麼要加be？ 求解，謝謝～

. Did I embarrass you when I told our friends that you and your classmate Ken used to be dating?

想問第八題為什麼選B

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求解

G6. We our Vacations In the mountains. But now the scene 1s not as beautiful as It was. 必K, (A) used to spend (B) used to spending (C) are used to spend (D) are used to spending

請問第四題可以寫成My sister is used to listening to broadcast when she is studying 嗎 謝謝～

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想問18～～

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請問第五題為什麼不能選b或是d呢

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請問第一題B不行嗎？

實力評量 作 (還 押 Q末s !. My grandparents, who just moved from the countryside, tt 績affic noilse 和 負e city. (A) didn'f use (tB)haven'tused (Cl not used (tpD) haven' tgotten used 2 六 jere to atemple at the foot ot the moumtal, (A) Is used; pe tfB) used; being (C) used; be (D) is usedy be 3. 和obots can human workers to do dangerous Work, 全 3

請問為什麼用for？