单项选择题

Our life has but a short__________

A．duration
B．span
C．episode
D．range
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单项选择题
I don’t think __________possible to finish so much work within so short a time.
A．this
B．that
C．its
D．it
单项选择题
If the appliance is defective, write directly to the manufacturer__________complain to your local consumer protection association.
A．then
B．or
C．but
D．though
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