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
Nobody came to see me while I was out, ______
A．did they
B．didn't they
C．did she
D．did he
单项选择题
The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.
A．at length
B．in full
C．on end
D．in time
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