we have been ….. them very carefully
a) watched
b) watch
c) watching
He ….. been talking to her father
a) have
b) has
c) is
I have been ….. how to use the rifle
a) explain
b) explains
c) explaining
She has ….. explaining how it was to me
a) been
b) be
c) was
I ….. been waiting for him since 3 o’clock
a) has
b) have
c) am
he has been ….. problems with insomnia
a) have
b) having
c) has
They ….. been having a series of heart attacks
a) has
b) have
c) are
What ….. you been doing?
a)have
b)are
c)has
I have been …… worthless
a) feel
b) feeling
c) felt
she ….. been feeling happy
a) is
b) has
c) have
We ….. been feeling better since returning from İstanbul
a) are
b) have
c) has