单项选择题

Advertising media like direct mail, radio, television and newspapers ______ to increase the sales of industrial products.

A．have been used
B．will be used
C．is being used
D．has been used
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单项选择题
By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.
A．are living
B．will be living
C．have lived
D．will have lived
单项选择题
Such ______ the case, there are no grounds to justify your complaints.
A．was
B．is
C．is being
D．being
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