51.Well，I've been out of touch with most of my oid friends, only one or two still drop me a line occasionally.

四级词汇讲解:

该句中用现在完成时have been…表达了“到目前为止的某种情况”。本句需要注意的是only之后的内容，因为此部分常常是考试的重点。

短语be out of touch with……的意思是“和……失去联系”，与之对应的表达是keep in touch with...，意为 “与…保持联系”。如:Kate keeps in touch with her classmates by emails when she is studying abroad.凯特在国外留学时，通过电子邮件和同学们保持联系。drop sb. a line也是听力考试中常见的表达，意为“给某人写信(通常指写一封较短的信)”。如:Don't forget to drop me a line when you get to Canada.到加拿大后，别忘了写信给我。