问题补充：
—Mum, I’ m going to Maria’ s birthday party this evening. —.
A. Why not
B. Good idea
C. Come back early
D. Have a good time
答案：
A. Why not
B. Good idea
C. Come back early
(答案→)D. Have a good time
解析：句意：——妈妈，今天晚上我将要去参加玛利亚的生日聚会。——玩得高兴点。A. Why not为什么不？B. Good idea 好主意；C. Come back early 早点回来；D. Have a good time玩得高兴点。结合句意，要去参加聚会，因此要祝他玩得高兴。故选D。
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