单项选择题

Evidence came up ______ specific sounds are recognized by babies as young as 6 months old.

A．what
B．which
C．that
D．whose
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单项选择题
The manager of the company insisted that all the staff members ______ the new safety rules.
A．would observe
B．observe
C．observed
D．will observe
单项选择题
If you can' t put your PC ______ good use, sell it to those who really need it.
A．into
B．of
C．to
D．with
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