单项选择题

— Look! That man looks like Mr. Brown. — It______ be him, for he ______ America.

A． can't; has gone to
B． can't; has been to
C． mustn't; has been to
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单项选择题
— ______ are the Olympic Games held — Every four years.
A． How often
B． How soon
C． How long
单项选择题
—How long have you ______ there —About four years.
A． come
B． gone
C． worked
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