单项选择题

People were afraid to leave their house,______ the police had been ordered to stand by in case of emergency, they were just as confused and helpless as anybody else.

A．and even if
B．but since
C．however after
D．for though
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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
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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