单项选择题

Mary had finished her homework ______ the time I got home.（）

A. until
B. at
C. by
D. when

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The population of the world has grown very fast ______ four hundred years.（）

A. for pass
B. in the pass
C. in the past
D. for past
单项选择题
If you want to book a round-trip ticket, you'll have to pay ______ $30.（）

A. more
B. other
C. the other
D. another
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