单项选择题

I'm sorry to have taken up too much of your ______ time.

A．worthy
B．valueless
C．valuable
D．priceless
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单项选择题
In the garden bees moved from ______ flowers to purple ones.
A．colorful
B．prosperous
C．pink
D．bright
单项选择题
______ , the ship's captain changed course.
A．To be warned
B．To have been warned
C．Having been warned
D．Being warned
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