单项选择题
Acids constitute a family of (chemical compounds) that, (in) (solution), have the ability to turn certain blue vegetable dyes red, a corrosive action on metals, and (taste sharp).
A．chemical compounds
B．in
C．solution
D．taste sharp
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单项选择题
Greeley's injunction Go West, young man resulted in a massive migration of population, with people occupying land ______ no one held title of ownership and that had yet to be sold.
A．to which
B．that
C．which
D．of which
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单项选择题
Obviously, he decided not to say anything about it because he hoped to ______.
A．keep it as a secret
B．keep it to be a secret
C．keep it a secret
D．keep it being a secret
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