单项选择题

______is well known, the key to success lies in hard work.

A．As
B．That
C．Which
D．What
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单项选择题
Evidence came up______specific speech sounds are recognized by babies as young as 6 months old.
A．where
B．that
C．which
D．what
单项选择题
The teacher, as well as all his students, ______by the dancer's performance.
A．was impressed
B．had impressed
C．impressed
D．were impressed
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