what… you doing? a) is b) were c) did d) are 03/09/2021 Bởi Serenity what… you doing? a) is b) were c) did d) are
B+ D
What are you doing? => Hiện tại tiếp diễn
What were you doing? => Qúa khứ tiếp diễn.
d
thì present continuous