. --So hard __________ in the past few months that he has made great progress in English.

    --I can see that, only a few mistakes he made in this exam.

    A. he worked                        B. did he work

    C. he has worked                     D. has he worked

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科目：高中英語(yǔ) 來源：同步題 題型：單選題

You have failed two tests. You'd better start working har-   der,________you won't pass the course.      
[     ]

A. and            
B. so            
C. but            
D. or

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