[ Grammar ]
– Do you know that Mrs. Jackson (work) ____________ here for sixteen years?
– I thought she started working here ten years ago.
A. has worked
B. have worked
C. worked
D. works
Select your answer:

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Mark’s flight ________ cancelled. There’s a lot of fog in the London area this morning.
A. may not have been
B. can’t have been
C. may have been