题干
The Shenzhou IX spacecraft returned to the earth safely _______ June 29th, 2012.
A：at
B：in
C：on
D：from
答案(点此获取答案解析）
C
The Shenzhou IX spacecraft returned to the earth safely _______ June 29th, 2012.
A：at
B：in
C：on
D：from
