. —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
這題考查時(shí)態(tài)，句意是：--你為什么不回答他們的問候？--對(duì)不起，我沒意識(shí)到他們?cè)谙蛭覔]手。所以是過去沒意識(shí)到，另外主句是過去時(shí)，從句也是相應(yīng)的過去時(shí)。選C。
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