完成進行時是完成時的強調(diào)形式，主要有現(xiàn)在完成進行時,，過去完成進行時

（1）現(xiàn)在完成進行時

表示動作從過去某一時刻開始,，狀態(tài)一直延續(xù)到現(xiàn)在，有可能繼續(xù)持續(xù)下去,。例如：

I have been looking for my lost book for three days, but I still haven’t found it.

（2）過去完成進行時表示過去某一時刻之前開始的動作或狀態(tài)一直延續(xù)到過去某一時刻,。例如：

It had been raining cats and dogs傾盆大雨for over a week and the downpour had caused landslides in many places.

舉例1. Now that she is out of a job, Lucy ____ going back to school, but she hasn’t decided yet.

A. had considered 　　　B. has been considering

C. considered　　　　　　 D. is going to consider

舉例2. The crazy fans _______ patiently for two hours, and they would wait till the movie star arrived.

A. were waiting 　　　B. had been waiting

C. had waited 　　　　　D. would wait

舉例3. She ______ the office, so we had to wait outside.

A. had cleaned 　　　　　　B. cleaned

C. had been cleaned　　　　D. had been cleaning