单项选择题

Scientists can predict regions ______ new species are most likely to be found.

A. where
B. when
C. why
D. how
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Why do you want to change your job ______ you have got such a good one already
A. because
B. when
C. since
D. as
单项选择题
Nobody has the right to ______ his thought on others.
A. impose
B. effect
C. influence
D. enforce
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