单项选择题

Because American parents believe that knowledge leads to a meaningful life, they try to give youngsters many opportunities to develop skills and______ interests.

A．worth
B．worthy
C．valuable
D．worthwhile
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单项选择题
It is strange that he______ so rude to you, though you did so much for him.
A．should be
B．should have been
C．is
D．was
单项选择题
This book deals with questions______ China' s Agrarian Revolutionary War.
A．concerned
B．concerned over
C．concerning with
D．concerning
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