单项选择题

The nurse watched over the patient and waited ______ him day and night.

A．about
B．for
C．on
D．up
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单项选择题
After ten years' absence he came back only to find his family was not ______ it used to be.
A．which
B．what
C．when
D．such
单项选择题
______ their work will give a better feel for the wide differences between the two schools of thought.
A．To have reviewed
B．Having reviewed
C．Reviewing
D．Being reviewed
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