B.

would have learned

  C.

learned            

  D.

had learned

【分析】

答案选 D。因为上大学是过去，学了五千个英语单词是在上大学之前，即“过去的过去”，所以用过去完成时。

2.

When the old man _________ to walk back to his house, the sun _________ itself behind the mountain.

A.

started; had already hidden    

          B.

had started; had already hidden

C.

had started; was hiding            

       D.

was starting; hid

【分析】

答案选 A。根据句意，“开始回房子”发生在过去，“太阳落山”是在“开始回房子”之前，故过去的过去。

3.

Father _________for London on business upon my arrival, so I didn’t see him.

A.

has left      

       B.

left              

    C.

was leaving    

       D.

had left

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