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You will be late ______ you leave immediately.

A. unless 　 B. until　 C. if 　 D. or

You will be late_______you leave immediately.

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

You will be late ______ you leave immediately.

　 A. unless 　 B. until  C. if 　 D. or

You will be late ______ you leave immediately.

　 A. unless 　 B. until

　 C. if 　 D. or

You will be late ________ you leave immediately.

[　　]