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. THE PHONE _______ FOR SEVERAL MINUTES BEFORE I H...
. THE PHONE _______ FOR SEVERAL MINUTES BEFORE I HEARD IT.A). WAS RI...
KIEM TRA 45PHUT SO 1
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4). The phone _______ for several minutes before I heard it.
A). was ringing B). has been ringing C). had been ringing D). have been ringing
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4)
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KIEM TRA 45PHUT SO 1