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------Tony, are you listening to me ？
------Sorry sir, I      to understand what you said just now.
A．tryB．was tryingC．triedD．have tried
B

試題分析：句意：---托尼，你聽我說嗎？---對不起，先生，我正在理解你剛才說的話。由題干的語境可以看出，此處應(yīng)是說話者剛剛正在盡力想做某事，因此用過去進行時，故選B。 
考點: 考查動詞時態(tài)的用法。
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