单项选择题

______ from space, our earth, with water covering 70% of its surface, appears as a "blue planet".

A. See

B. Seeing
C. Seen

D. To be seen
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单项选择题
Tom doesn’t want to work right away because he thinks that if he ______ a job he probably wouldn’t be able to play football very often.
A. has to get


B. had got
C. were to get


D. could have got
单项选择题
We have done things we ought not to have done and ______ undone things we ought to have done.
A. leave
B. leaving
C. left

D. will leave
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