[ Past Tense vs Present Perfect Tense ]
Mavis and Katy __________ (be) good friends since the beginning of the school term.
A. have been
B. has been
C. were
D. was

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Prepositions › ViewShe met her best friend in September, 1999 __ Seoul.
A. At
B. On
C. In
Adverb of Frequency and Past Continuous Tense › View
While my mother….., my father…..
A. Was washing, was watching
B. Was washing, was watching
C. Washed, was watching
D. Washed, watched