Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Sometimes Mr. Pike _________work very late at night to do some important experiments.
A.had to
B.has to
C.have to
D.has been
Sometimes Mr. Pike _________work very late at night to do some important experiments.
A.had to
B.has to
C.have to
D.has been
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Hóa Học lớp 12
