—Why are you so depressed? —I _____ my MP4 player on the bus.
#102992
A
had lost
B
am lost
C
have lost
D
was lost
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—You look tired.  —Yes. I _____ non-stop until twelve o’clock.   
#103911
A
hasn’t been working
B
wasn’t working
C
was working
D
didn’t work
---Why do you keep looking back? ---I have a feeling that we _______.
#103489
A
were followed
B
have been followed
C
are being followed
D
are following