1．構(gòu)成：had been + 現(xiàn)在分詞

2．功能：表示過(guò)去某個(gè)時(shí)間之前一直在進(jìn)行的動(dòng)作。
►. She said that she had been typing a paper before I came in.

比較：
►. The girl had cleaned up the room, so it was tidy.
►. The girl had been clearing up the room, so we had to wait outside.

測(cè)試精編

1. It ________ for four days when we arrived, so the roads were very muddy.
A. was raining B. would be raining C. had been raining D. has rained

2. He told us that he ________ there since 1982.
A. has been living B. had been living
C. would have lived D. was living

3. He had been learning English for 3 years before he came here and ________ now.
A. is still learning B. had been learning
C. was still learning D. has been learning

4. By the end of last week, he ________ in the company for 10 years.
A. had worked B. had been working
C. will have worked D. would have worked

5. Not until then did people know that he ________ important military information to the enemy for a long time.
A. sold B. would sell C. had sold D. had been selling

KEYS

1. C 2. B 3. A 4. B 5. D