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  3. For thousands of years comets had been a mystery to S

For thousands of years comets had been a mystery to S

游客2023-08-02  38
问题     For thousands of years comets had been a mystery to                        S1.______
man. They travel across the sky very fast and have a
bright "tail" of burnt gas. The comet Tempel 1 has an                          S2.______
orbit far outside the orbit of the furthest planet in our
solar system, Pluto. It has had been there for 4.6 billion years,              S3.______
133 million kilometres from Earth. Last week
a little American spacecraft crash into Tempel 1.                              S4.______
The spacecraft had a camera and it took a photograph
of the comet every minute after it finally crashed into                        S5.______
its surface. The space mission to Tempel 1 cost $335
million and was called Deep Impact. Spacecraft was                             S6.______
travelling at 37,000 kilometres per hour when it hit the comet
and the crash completely destroying the spacecraft. But before                 S7.______
it hit the comet, the spacecraft took some amazingly photographs.              S8.______
The last one was a close-up picture the spacecraft spent                       S9.______
just 3 seconds time before it crashed into the comet.                          S10.______
选项
答案 had改成have
解析 这是考过去完成时和现在完成时。当有一个过去的时间点作参照的时候，这个时间点之前发生的事情要用过去完成时，但这里并没有一个过去的时间点作参照，所以应用现在完成时。
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