helicopter can take off and land straigh
题型:选择题
问题:
helicopter can take off and land straight up or down, and can also stay
still in air.
A.The; an
B.A; the
C.A; 不填
D.The; 不填
helicopter can take off and land straight up or down, and can also stay
still in air.
A.The; an
B.A; the
C.A; 不填
D.The; 不填