单项选择题

Before his death last year, Professor Johnson decided that he（）leave $2,000,000 to his university.

A．can
B．would
C．may
D．shall

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填空题

What is the purpose of the meetingEnabling the receivers to have a more in-depth knowledge of their（）.

单项选择题

It seems that critical technology is often（）.

A．unavailable to the importing countries
B．unavailable to the exporting countries
C．not suitable to the developing countries
D．keeping back the exporting countries’ economy