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商务印书馆出版的黄子文先生的《英语动词——语法和惯用法》(简称《英》)P.29—30有这样一段话:(d)The present perfect progressiveform:This form is used to indicate anactivity that extends over a period of timewhich began in the past and includes the
The English version of the English verb-grammar and idioms (P.29-30) published by the Commercial Press publishes a passage like this: (d) The present perfect progressive progressive form: This form is used to indicate an activity that extends over a period of timewhich began in the past and includes the