完成句子 He looks sleepy．He must last night, writing the essay．
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完成句子
He looks sleepy．He must ________(熬夜了)last night, writing the essay．(stay)
试题答案
答案：have stayed up
完成句子
He looks sleepy．He must ________(熬夜了)last night, writing the essay．(stay)
答案：have stayed up