单项选择题

No bread eaten by man is so sweet as ______ earned by his own labour.

A．one
B．that
C．such
D．what
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单项选择题
He took down a square green bottle, ______ he poured into a dish.
A．its content
B．which content
C．the content of that
D．the content of which
单项选择题
In the experiment we kept a watchful eye ______ the subtle changes and recorded every detail.
A．for
B．at
C．on
D．to
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