单项选择题

In a second-hand bookshop, Billy came across a book which he thought was certainly a （）edition.

A. rare
B. scarce
C. seldom
D. hardly

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单项选择题

I don't like this hat. Please show me （）

A. another
B. the other
C. others
D. both

单项选择题

Adults sometimes envy children who play all the time （） they themselves have to work, rain or shine.

A. while
B. once
C. since
D. though

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