-Why are you so late? I for more than an hour. -I'm terribly sorry. I overslept
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—Whyare you so late? I ________ for more than an hour.
—I'mterribly sorry. I overslept and missed the bus.
A.am waiting
B.was waiting
C.have been waiting
D. waited
试题答案
答案：C
解析：| 用现在完成进行时体现一直在进行的动作。
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