白蛋白合成减少的疾病是（）。
A.慢性肝炎
B.营养不良
C.糖尿病
D.大面积烧伤
E.肾病综合征
参考答案：A
He had just sent an email to his pal on the Internet ________ the system broke down.
A．while
B．when
C．after
D．since
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