since
for
from
in
Answer is Wrong!
Answer is Right!
The correct answer is A. since.
The word “since” is used to indicate a point in time in the past from which something has been happening or continuing. In this case, the girls have been teasing the boys for 20 minutes.
The other options are not correct because they do not indicate a point in time in the past. The word “for” is used to indicate a period of time during which something happens or continues. The word “from” is
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