---Could I go boating this weekend Dad?---Yes you . But you come back before lunch.A. c

问题补充：

---Could I go boating this weekend, Dad?

---Yes, you . But you come back before lunch.

A. could; must

B. can; must

C. could; should

D. must; should

答案：

A. could; must

(答案→)B. can; must

C. could; should

D. must; should

解析：句意：这个周末我能去划船吗？是的，你可以。但是你必须在午饭前回来。Could you do …?中的could表示委婉语气，不是过去时态。故回答是经常用，can. Must,必须，表示一种主观看法。should,应该。表示某钟责任和义务。根据句意，故选B。

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