－Excuse me, does Mr Smith’s son live here?－He _________ be here, but he has moved.
#60880
A
has to
B
used to
C
tried to
D
happened to
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Try to guess its meaning when you meet a new word. Don’t _____________ your dictionary all the time.
#62087
A
work on
B
try on
C
keep on
D
depend on