Stephen Hawking has expressed his opinion   ___ humans might one day be able to make spaceships capable of such speeds that time on board would slow down.
#69972
A
that
B
whom
C
which
D
what
推荐题目
_____ you may have, you should gather your courage to face the challenge.
#68233
A
However serious a problem.
B
What a serious problem.
C
However a serious problem.
D
What serious a problem.
_______ she is, she has not much inside.
#67704
A
Intelligent girl as
B
An intelligent girl as
C
Intelligent a girl as
D
Girl intelligent as