— What made her so happy?
— ________ her son passed the driving test.

A. That  
B. Because
C. Since  
D. When
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科目：高中英語 來源：同步題 題型：單選題

— What made her so happy?
— ________ her son passed the driving test.
   [    ]
A. That  
B. Because
C. Since  
D. When

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