помогите , пожалуйста , сегодня тест
49 I ... my parents since last Christmas.
a) don't see
b) didn't see
c) haven't seen
d) hadn't seen
50 l am busy,... I?
a) am
b) is not
c) aren't
d) are
51 They are staying with friends at the moment,...?
a) are they
b) they are
c) they aren't
d) aren't they
52 She had studied Spanish before she ... to Madrid.
a) had come
b) comes
c) came
d) was coming​