问题
选择题
The scientists are making further research to develop more advanced rockets________spaceships can be launched.[ ]
A．which
B．with which
C．/
D．with that
答案
答案：B
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The scientists are making further research to develop more advanced rockets________spaceships can be launched.[ ]
A．which
B．with which
C．/
D．with that
答案：B