单项选择题

The outline of the figure was barely _______ in the darkness.

A．susceptible
B．invisible
C．perceptive
D．perceptible
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单项选择题
Her short stay in Kentucky in the mid-nineteen hundreds was very important to author Mary Holmes, _______ provided the background to several of her novels.
A．it was
B．for it
C．much of
D．by then
单项选择题
_______ is to arrange them in groups or sequences according to a plan.
A．Things classified
B．In classifying things
C．As classification of things
D．To classify things
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