可引起肝脏周边性脂肪变性的是（）
A.慢性肝淤血
B.四氯化碳中毒
C.缺氧
D.有机磷中毒
E.氯仿中毒
参考答案：D
Eric had received training in computer for one year _______ he found a job in a big company.
A．before
B．after
C．since
D．as
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