单项选择题

Negro slavery, many claimed, was good for all ______.

A．concerned
B．is concerned
C．to concern
D．that concerns
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单项选择题
To support the general statement in the first sentence, each ______ sentence in the paragraph provides a different example.
A．relevant
B．subsequent
C．coherent
D．antecedent
单项选择题
Modern man is careless when disposing ______ his garbage.
A．of
B．to
C．at
D．about
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