单项选择题

The supervisor didn't have time so far to go into it____________, but he gave us idea about his plan.

A． at hand
B． in turn
C． in conclusion
D． at length
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单项选择题
The newly-built Science Building seems ____________enough to last a hundred years.
A． spacious
B． sophisticated
C． substantial
D． steady
单项选择题
The Portuguese (give) a great deal of credit to (one man) for (having promoted) sea travel, that man (was) Prince Henry the navigator, who lived in the 15th century.
A．give
B．one man
C．having promoted
D．was
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