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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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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We are all surprised to know that Mr. Zhang has been（）in that case.

A．involved
B．protested
C．withdrawn
D．recovered
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