摘要：(四)大多数现在完成进行时的句子不等同于现在完成时的句子. I have been writing a book. 我一直在写一本书. I have written a book. 我已经写了一本书. They have been building a bridge. 他们一直在造一座桥. They have built a bridge. 他们造了一座桥.

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