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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Fred has ______ kind of humour that can only be appreciated by those willing to search beneath the surface.
A．an obvious
B．a hidden
C．a subtle
D．a controlled
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They suggested us ______ our luck at the casino.
A．to try
B．try
C．trying
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