单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He knew about it from an ad in the newspaper.
B．A close friend told him about it.
C．He heard about it from one of his relatives.
D．He saw it on a list of job openings.
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In the second half of the twentieth century when computers came into use, there was a proposal that ______ keyboards should be used.
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In the twenty-first century it is ______ that the keyboard will ever be changed.
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