题目

5÷7＝∶＝ 答案：【1】5【2】7【3】{#mathml#}57{#/mathml#}  ---- Mummy, can I go out for a play for a while?    ---- Yes, if you _______. But make sure you come back before 8:00. A. shall    B. will    C. must    D. could