单项选择题

The reason（）he didn't attend the meeting was not made clear.

A、why
C、which
B、is
D、that

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单项选择题

（）you are leaving tomorrow, we can eat dinner together tonight.

A. For
B. Since
C. Before
D. While

单项选择题

Only once in his life had Douglas permitted himself（）control of his emotions.

A. to lose
B. lost
C. lose
D. losing

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