MR BROWN HAS BEEN A TEACHER FOR TWENTY YEARS BEFORE HE BECAME A HEA...
Câu 7: Mr Brown has been a teacher for twenty years before he became a headmaster.
A. became
B. before
C. has been
D. for
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the
following questions from 8 to 19:
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