单项选择题


A．allowed
B．promised
C．able
D．willing
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单项选择题
A．dutyB．adviceC．visitD．time
A．duty
B．advice
C．visit
D．time
单项选择题
While (remembering) mainly (for) the invention of the telephone, Alexander Graham Bell devoted his life (to) (helping the deaf).
A．remembering
B．for
C．to
D．helping the deaf
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