问题
选择题
She was very hardworking ________he was very lazy.As a result，she passed the examination，but he
failed.[ ]
A．when
B．since
C．while
D．as
答案
答案：C
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She was very hardworking ________he was very lazy.As a result，she passed the examination，but he
failed.[ ]
A．when
B．since
C．while
D．as
答案：C