单项选择题

After a night's sound sleep, the clerk seems to be ______ enough to finish the heavy task in several hours.

A．radiant
B．conscientious
C．conspicuous
D．energetic
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单项选择题
______ his telephone number, she didn't know how to get in touch with him.
A．Having forgotten
B．Forgetting
C．To have forgotten
D．To forget
单项选择题
______ some flowers contain more nectar than others, how does a honeybee worker, faced with a patch of flowers containing variable amounts of nectar, decide when to stop collecting
A．Given that
B．Though
C．If
D．while
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