单项选择题

After that, Madame Curie did one experiment after ______.

A. one
B. other
C. another
D. the other
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单项选择题
Think （）and you'll have some idea.

A. over
B. over it
C. it over
D. it
单项选择题
Try to work out the problem ______.
A. all by yourself
B. by you
C. all by yours
D. by your
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