I was out town at the time, so I don’t know exactly how it ____________________.
#103133
A
has happened
B
happened
C
happens
D
was happening
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 We    on it for several hours but we haven't yet reached any conclusion. 
#99883
A
are working
B
work
C
have been worked
D
have been working
—I failed again. I wish I _________ harder.—But you _________.
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A
had worked; hadn’t
B
worked; don’t
C
had worked; didn’t
D
worked; didn’t
The manager was concerned to hear that two of his trusted workers ______. 
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A
will leave
B
are leaving
C
have left
D
were leaving