The astronaut did many experiments in the spaceship,__________________much help for knowing space.
A.which we think it is | B.which we think are of |
C.of which we think is | D.I think which is of |
推荐套卷
The astronaut did many experiments in the spaceship,__________________much help for knowing space.
A.which we think it is | B.which we think are of |
C.of which we think is | D.I think which is of |