单项选择题

She worked hard ______ everything would be ready by the time he came back.

A. since
B. so that
C. as if
D. unless
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______ I had walked for six hours, I was tired out.
A. After
B. Before
C. When
D. As
单项选择题
______ you understand this rule, you'll have no further difficulty.
A. Once
B. Unless
C. As
D. Until
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