WesentTiangong-1intothespace
问题详情：
We sent Tiangong-1 into the space ______ September 29th.
A. by B. on C. at D. in
【回答】
B
知识点：介词和介词短语
题型：选择题
问题详情：
We sent Tiangong-1 into the space ______ September 29th.
A. by B. on C. at D. in
【回答】
B
知识点：介词和介词短语
题型：选择题
