单项选择题

Some people spend their lives ______ about money.

A. thought
B. think
C. thinking
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单项选择题
David is the shortest boy although he is older than any ______ boy in the class.
A. another
B. other
C. others
单项选择题
The new students asked ______ the school had a good library.
A. when
B. whether
C. where
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