单项选择题

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

A．where
B．that
C．which
D．what
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Helen was much kinder to her youngest child than she was to the others, ______ , of course, made the others jealous.
A．who
B．what
C．that
D．which
单项选择题
______ does Mr. Johnson go to London on business At least once a month.
A．How many
B．How long
C．How often
D．How
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