单项选择题

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

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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

单项选择题

There ______ some books and a pen on the desk.（）

A. is
B. are
C. be
D. was

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