单项选择题

Mr. Brown did not tell us（）or not he'll be leaving next week.

A. whether
B. if
C. either
D. weather

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In some countries,（）is called equality floes not really mean equal rights for all people.

A. which
B. that
C. what
D. one

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I'm sure the letter won't arrive in time（）it is sent by air.

A. if
B. until
C. because
D. unless

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