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