单项选择题

I had just started back for the house to change my clothes ______ I heard voices.

A．as
B．when
C．after
D．while
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单项选择题
Our ______ sensitivity decreases with age. By age 60, most people have lost 40 percent of their ability to smell and 50 percent of their taste buds.
A．sensible
B．senseless
C．sensitive
D．sensory
单项选择题
______ I sympathize, I can't really do very much to help.
A．As
B．As long as
C．While
D．Despite
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