问题补充：
— Where is Millie? — She a trip in her room.
A. plan
B. plans
C. is plan
D. is planning
答案：
A. plan
B. plans
C. is plan
(答案→)D. is planning
解析：考查情景交际和时态。“米莉在哪里？”“她在房间里制定旅行计划呢。”表示说话时正在进行的事情，用现在进行时。A主谓不一致；C双谓语。故选D。
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