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. —Why didn’t you response to their greeting?  
—Sorry. I ______they ______ to me.
A.don’t realize; are waving B.don’t realize; were waving
C.didn’t realize; were wavingD.didn’t realize; are waving
C
这题考查时态,句意是:--你为什么不回答他们的问候?--对不起,我没意识到他们在向我挥手。所以是过去没意识到,另外主句是过去时,从句也是相应的过去时。选C。
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