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
The explorer lost his way so he climbed to the top of the hill to ______ himself.
A．spot
B．locate
C．place
D．situate
单项选择题
He spoke slowly so that everyone ______ what he had said.
A．ought to understand
B．should understand
C．may understand
D．must understand
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