单项选择题

I would have gone to visit him in the hospital had it been at all possible, but I ______ fully occupied the whole of last week.

A．were
B．had been
C．have been
D．was
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单项选择题
The chief reason for the population growth isn't so much a rise in birth rates ______ a fall in death rates as a result of improvements in medical care.
A．and
B．as
C．but
D．or
单项选择题
The Social Security Retirement Program is made up of two trust funds, ______ could go penniless by next year.
A．the larger one
B．the larger of which
C．the largest one
D．the largest of which
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