单项选择题

If you want to make money, buy cheap and sell______.

A．high
B．dear
C．expensive
D．deep
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You should have put the yogurt into the fridge, I expect it ______ undrinkable by now.
A．became
B．had become
C．has become
D．becomes
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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