-What’s his brother?-He is a teacher.He__________ maths at a school.
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A
taught
B
has taught
C
teaches
D
will teach
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Inthepast few years,thousandsoffilms     all overtheworld.
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A
have produced
B
have beenproduced
C
are producing
D
are beingproduced
No one knew what        because of the thick fog.
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A
he had happened
B
had happened to him
C
had he happened
D
has happened to him