单项选择题

Once lost().

A. it is hard to get such a chance again
B. to get such a chance will be difficult
C. one can never get such a chance again
D. such a chance might never come again

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单项选择题

--Can you help me --().

A. It doesn't matter.
B. Don't worry.
C. Sure, What is it
D. No, thanks.

单项选择题

Wilma became the first American woman to win three Olympic gold medals in track, () made her mother very proud.

A. it
B. that
C. which
D. this