单项选择题

It was very ______ of you to offer your seat to the old man.

A．trustful
B．conscious
C．considerate
D．considerable
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单项选择题
He has not quite solved the problem yet, but he is ______ it.
A．making of
B．working on
C．clearing up
D．trying out
单项选择题
______ Mary had heard that sound was she really frightened.
A．Not when
B．Not as
C．Not until
D．Until
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