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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