单项选择题

______ rapidly by the body, sugar provides a quick energy source.

A．Digested
B．To digest
C．Digesting
D．Having digested
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单项选择题
The boy ______ that he should return before 7 o' clock.
A．had been reminded
B．were reminding
C．is reminded
D．has reminded
单项选择题
How I regret the hours ______ in the woods and fields, ______ I should have studied!
A．wasting; where
B．wasted; where
C．wasted; when
D．wasting; when
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