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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单项选择题
The young man admitted (to make) errors (in judgment) (on) more than one (occasion).
A．to make
B．in judgment
C．on
D．occasion
单项选择题
I was completely (at a loss) for words, because I felt (sorrier) (than) angry (at) what had happened.
A．at a loss
B．sorrier
C．than
D．at
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