A dozen ideas were considered the chief architect decided on the design of the building.
A. before
B. whether
C. unless
D. because
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(答案→)A. before
B. whether
C. unless
D. because
解析：考查连接词。句意“在总建筑师对大楼的设计作出决定前，有十二个想法被考虑了。”根据句意可知，应该用连接词before“在......之前”。故选A。