问题描述：
单选Put everything in order in the living room ( ) your mother sees it and gets angry.
1.Put everything in order in the living room ( ) your mother sees it and gets angry.A.before B.when C.until D.since
2.At the beginning of the 20th century ,the idea of travelling to the Moon was thought （ ）crazy.A.being B.to be C having been D.to have been 选什么呢?
1.Put everything in order in the living room ( ) your mother sees it and gets angry.A.before B.when C.until D.since
2.At the beginning of the 20th century ,the idea of travelling to the Moon was thought （ ）crazy.A.being B.to be C having been D.to have been 选什么呢?
问题解答：
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