单项选择题

I hadn't seen him for years, but I ______his voice on the telephone.

A．realized
B．discovered
C．recognized
D．heard
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单项选择题
When there are small children around, it is necessary to put bottles of pills out of______.
A．hand
B．hold
C．place
D．reach
单项选择题
He left ______an important detail in his account.
A．off
B．over
C．behind
D．out
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