Before traveling in space, you must know what it might feel like_____in an imaginary environment.  
#98721
A
to travel
B
traveling
C
to be traveling
D
travel
推荐题目
Our school, _____ in 1943, will celebrate its 70th anniversary this year.
#90900
A
founded
B
founding
C
to be founded
D
was founded
Do you know we have much difficulty ____ the work on time.. 
#97766
A
on finishing
B
finishing
C
to finish
D
at finishing
I don’t think the problem you referred to is worth______.
#96942
A
thinking
B
being thought over
C
thinking over
D
considering of