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
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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
单项选择题
Whether to go to college is optional ______that no student is required to do so as he is required by law in most states of America to go to high school.
A．in a sense
B．in the way
C．in the sense
D．in the case
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