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When ________how a statue from distant Greece，in China，researchers explained that it was no doubta r...
题目内容：
When ________how a statue from distant Greece，in China，researchers explained that it was no doubta result of Alexander the Great’s influence．
A． they were asked；should appear；
B． being asked；can have appeared；
C． asked；must have appeared；
D． asked；could have appeared；
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