I have been keeping the portrait _____ I can see it every day, as it always reminds me of my childhood in Paris.
A.since
B.where
C.as
D.if
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B解析考查状语从句。Where I can see it every day修饰动词短语keeping the portrait 。结合句意可知B正确。句意：我一直把肖像放在每天都能看见的地方，因为它总让我想起我在巴黎的童年。