摘要:现在完成时与现在完成进行时的区别: 前者着重表示过去动作对现在的影响或结果; 后者着重表示过去动作的持续进行 a. I have written six letters since I got back.我己经写了六封信 b. I have been writing letter since I got back. 我回家后一直在写信 c. I have read this book.我读过这本书了 d. I have been reading this book.我一直在读这本书
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