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【单选题】
听力原文： Astronauts have moved the American shuttle Discovery and the Hubble telescope into a higher orbit. They took the action when part of the unexploded rocket was expected to pass within less than a kilometer from the spacecraft. Earlier the astronauts made repairs to the telescope that would permit experts to look deeper into space than ever before. When were the shuttle and telescope moved into a higher orbit?A.
Before the telescope was repaired.
B.
After the rocket was exploded.
C.
When the rocket was to be within less than a kilometer from the spacecraft.
D.
When the experts could look deeper into space than ever before.
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举一反三
【简答题】导管存在于种子植物的木质部，它是由许多端壁形成穿孔的导管分子连接而成的。( )
【单选题】. --Were you late for the film? --Very late. Half of it ________ by the time we ________ the cinema.
A.
was shown; reached
B.
had been shown; reached
C.
was shown; had reached
D.
had been shown; had reached
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