must have been请问 must have been 是推测某人一直在做某事吗?

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musthavebeen请问musthavebeen是推测某人一直在做某事吗?musthavebeen请问musthavebeen是推测某人一直在做某事吗?musthavebeen请问musthave

must have been请问 must have been 是推测某人一直在做某事吗?
must have been
请问 must have been 是推测某人一直在做某事吗?

must have been请问 must have been 是推测某人一直在做某事吗?
推测某人一定做过某事