单项选择题

I am unable to __ what he is saying.

A．concentrate on
B．concentrate in
C．finish with
D．finish off
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单项选择题
1 __ into the dark, sure that I would finally reach the hospital.
A．work out
B．set out
C．make out
D．put out
单项选择题
By November 1973 oil supplies were critically low, creating the most __shortages of energy since World War II,
A．rigid
B．acute
C． dense
D．urgent
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