-- May I go out now. Dad? No. You let your mother know first.A. canB. mayC. needD. mus

问题补充：

-- May I go out now. Dad?

-- No. You let your mother know first.

A. can

B. may

C. need

D. must

答案：

A. can

B. may

C. need

(答案→)D. must

解析：考查情态动词词义。由答句中“不”，表示语气要求很坚决，应该是“必须”。