Up to now, thousands of red phone boxes, the old image of Britain, due to mobile phones.A

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A. removed
B. have removed
C. were removed
(答案→)D. have been removed
解析：答案：D　考查动词时态和语态。根据时间状语up to now通常与现在完成时连用，故排除A、C两项；主语“thousands of red phone boxes”与动词remove之间构成动宾关系，所以用现在完成时的被动形式。故选D项。