单项选择题

Don’t eat that fruit ______ it is ripe.

A. in case
B. unless
C. if
D. like
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Tom applied for the job three time ______ she was finally transferred to the new position.
A. until
B. when
C. before
D. while
单项选择题
My brother is a good businessman, ______ I am not.
A. who
B. whom
C. which
D. that
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