The scientists are making further research to develop more advanced rockets________spaceships can be

题目简介

The scientists are making further research to develop more advanced rockets________spaceships can be

题目详情

The scientists are making further research to develop more advanced rockets________spaceships can
be launched.
[     ]
A. which    
B. with which
C. /  
D. with that
题型:单选题难度:中档来源:同步题

答案

B

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