DO YOU KNOW THE REASON _______HUMANS ARE INTERESTED IN MARS AND OTH...
9. Do you know the reason _______humans are interested in Mars and other planets in
the solar system?
A.which
B.that
C.why
D.whose
9. Do you know the reason _______humans are interested in Mars and other planets in
the solar system?
A.which
B.that
C.why
D.whose