He said that he had been very busy since we last met.
他说自从我们上次会面以来他一直很忙。
If he had not been very busy at that time, he would have offered you more help.
要不是当时他很忙的话,他会给你更多的帮助。
He was busy preparing to welcome a well-known writer who had been invited to come to give a talk on modern literature at the public library that very evening.
他正忙于准备欢迎一个著名作家,这个作家晚上要在公共图书馆作关于现代文学的报告。
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