填空题

At a refinery the crude oil is ______ into its various parts.

【参考答案】

purified and separated
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填空题
Why was the doctor surprised when Miss Green came to see him again
单项选择题
A．One month.B．One week.C．Two weeks.D．Two months.
A．One month.
B．One week.
C．Two weeks.
D．Two months.
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