SincethreeChineseastronautspilotedShenzhouIXtolinkupwi...

问题详情：

 Since three Chinese astronauts piloted Shenzhou IX to link up with Tiangong-1, China’s exploration of _____ outer space has stepped into _____ new era.

A. /; a                            B. the; a                       C. a; the                       D. /; /

【回答】

A

知识点：冠词

题型：选择题