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题型：单选题
________from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.
- A.
Seen
- B.
Seeing
- C.
To see
- D.
Having seen
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题型：单选题
Tom regrets ________harder at school.
- A.
did not work
- B.
having not worked
- C.
not having worked
- D.
not have worked
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题型：单选题
When a machine of this kind is ________, the materials must be carefully chosen for its parts.
- A.
built
- B.
building
- C.
to build
- D.
to be built
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题型：单选题
If you go on letting your dog ________after cars, he'll end by ________over.
- A.
to run, running
- B.
running, running
- C.
run, running
- D.
run, being run
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题型：单选题
It is a good season in which ________in Switzerland.
- A.
travel
- B.
traveling
- C.
to travel
- D.
traveled
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题型：单选题
We need help badly, so ________ the interview with the applicants as quickly as possible．
- A.
realize
- B.
arrange
- C.
manage
- D.
hold
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题型：单选题
The brave soldier preferred ________ rather than ________．
- A.
to die;giving in
- B.
to die;to give in
- C.
to lose;losing
- D.
dying;to give in
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题型：单选题
Three hours later, people ________ from the building on fire．
- A.
tried to escape
- B.
could escape
- C.
managed to escape
- D.
tried escape
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题型：单选题
She would love to have gone to the party, but she _______ extra hours to prepare for a meeting
- A.
had to work
- B.
had worked
- C.
could work
- D.
would have worked
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题型：单选题
We plan to reach the North Pole in mid-July, and by then we _______ for six weeks.
- A.
are walking
- B.
have been walking
- C.
will be walking
- D.
will have been walking
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