[ Tenses ]
Sally has been working here _______ .
A. for six months
B. since six months
C. six months ago
D. six months

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Grammar › ViewBy the time he retired, Mr. Smith _________to most parts of the world.
A. has travelled
B. has been travelling
C. had travelled
D. travelled
Articles › View
We are studying for _____ exam tomorrow.
A. an
B. a
C. the
D. no article