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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The _____ crown jewels are kept in the Tower of London.
A．valued
B．valueless
C．invaluable
D．usable
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I was trying to read the directions _____ and absurd.
A．which was confused
B．which were confusing
C．that was confused
D．they were confusing
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