单项选择题

Every means ______ but without much result.

A．have been tried
B．has been tried
C．have tried
D．has tried
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单项选择题
She sent her son to England so that he could learn English from ______ speakers.
A．native
B．local
C．home
D．national
单项选择题
Never before that night ______ the extent of my own power.
A．had I felt
B．I had felt
C．did I feel
D．I did felt
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