单项选择题

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

A．For
B．Since
C．Before
D．While
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单项选择题
Johnson preferred ______ heavier work to do.
A．to be giving
B．to have given
C．to be given
D．having given
单项选择题
The shape of This World is closest to that of which of the following（）

A．A circle.
B．A triangle.
C．A square.
D．A cube.
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