单项选择题

She is a very ______ secretary: She never forgets anything or makes a mistake.

A．anxious
B．effective
C．adequate
D．efficient
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单项选择题
My two sons, Adam and Alexander, are eight and ten ______.
A．clearly
B．respectively
C．accurately
D．optionally
单项选择题
The reason for my refusal is ______ you're undependable.
A．because
B．due to
C．that
D．for
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