单项选择题

It was two days later（）they began to discuss my suggestion.

A．when
B．that
C．what
D．on which

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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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