The space suits can be adjusted so that the team can reproduce different levels of gravity as if they________in space.
#86407
A
are 
B
has been
C
were 
D
had been
推荐题目
If you want to borrow a football after school, your student ____ here.
#88148
A
has to leave
B
mustleave
C
has to be left
D
mustbe left
 — Where is John?   — He _____ in the library.
#90206
A
should be
B
must be
C
can be
D
must have been
I’d rather he ______ tomorrow afternoon.
#89155
A
will come
B
comes
C
coming
D
came