单项选择题

There are so many dresses there that I really don't know（）to choose.

A. whether
B. when
C. which
D. why

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

A、why
C、which
B、is
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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
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