单项选择题

Accounts have varied to ______ extent the educational reform will be implemented.

A. some
B. which
C. what
D. greater
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单项选择题
Having defeated the enemies, the tribal natives returned therefore to the island, ______ they were the principal inhabitants.
A. where
B. to which
C. of which
D. of it
单项选择题
In any case there would be no ______ for that to happen.
A. chance
B. opportunity
C. prospect
D. occasion
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