In order not to be disturbed,I spent three hours _B_ in

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In order not to be disturbed,I spent three hours ___B___ in my study.
A.locking B.locked
C.to lock D.being locked
Nearly every great building in Beijing was built ___B____ south.
A.to face B.facing
C.to have faced D.being facing

就是BB
再问：我是问原因，我知道答案。。。
再答：都是独立主格，你可以参考一下百度百科

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