单项选择题

A．of
B．off
C．down
D．/
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单项选择题
A．toB．ofC．offD．for
A．to
B．of
C．off
D．for
单项选择题
When did her teacher come to Helen Keller
[A] When Helen was 7. [B] When Helen was 17. [C] Immediately after Helen lost her sight and hearing.
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