单项选择题

The salmon spends its adult life in rivers and seas, but ______ .

A．its eggs are laid in streams
B．it lays its eggs in streams
C．in streams are laid its eggs
D．laid in streams are the eggs
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单项选择题
Never has a scientific explanation emerged ______ someone somewhere has objected to it.
A．that
B．which
C．whom
D．but
单项选择题
It ______ now pretty late, we took our candles and retired to our room.
A．is
B．being
C．turned
D．got
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