问题

He spent too much time talking on _______ phone whilewe were all busy at _______ work
A:so the school gave Mr Smith leave
B:the school had given Mr Smith leave
C:so Mr Smith went on leave from work
D:Mr Smith went on leave from work
B:the school had given Mr Smith leave
C:so Mr Smith went on leave from work
D:Mr Smith went on leave from work
正确答案是: