单项选择题

Evidence came up ______ specific sounds are recognized by babies as young as six months old.

A．what
B．that
C．which
D．whose
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单项选择题
It is time for me to see ______ dinner.
A．out
B．over
C．about
D．off
单项选择题
Although customers keep complaining about their poor service, they've made no ______ to make any improvement.
A．action
B．trial
C．attempt
D．progress
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