We
haven't
been
looking
for
a
flat
for
three
months
.
?
We
____________________
____________________
____________________
for
a
flat
for
three
months
.
Jane
hasn't
been
surfing
the
Web
all
morning
.
?
Jane
____________________
____________________
____________________
the
Web
all
morning
.
We
have
not
been
doing
a
lot
of
trips
round
the
country
.
-
We
____________________
____________________
____________________
a
lot
of
trips
round
the
country
.
The
children
have
not
been
revising
for
their
exams
since
last
week
.
-
The
children
____________________
____________________
____________________
for
their
exams
since
last
week
.
Our
engineers
have
not
been
developing
the
prototype
for
2
years
.
-
Our
engineers
____________________
____________________
____________________
the
prototype
for
2
years
.
My
boss
hasn't
been
reviewing
our
salaries
.
-
My
boss
____________________
____________________
____________________
our
salaries
.
