单项选择题

The reason（）I can't come is that I am having a headache.

A、 because
B、 why
C、 as
D、 for

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（）they talked,（）encouraged they felt.

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单项选择题
You can not see the manager（）you have made an appointment with him.

A、 if
B、 except
C、 unless
D、 when
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