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

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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

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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