2. 外语
  3. The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information).

The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information).

admin2011-01-26  72
问题 The United States (has sent) several (spacecrafts) into orbits (around the earth) and has collected a lot of (information).
选项 A、has sent
B、spacecrafts
C、around the earth
D、information
答案A
解析 改为sent。一般过去时陈述过去发生的事情。
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