单项选择题
Obviously, he decided not to say anything about it because he hoped to ______.
A．keep it as a secret
B．keep it to be a secret
C．keep it a secret
D．keep it being a secret
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单项选择题
Based on economic studies, it seems possible to forecast that a recession may ______ depression.
A．imply
B．indicate
C．symbolize
D．precede
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单项选择题
The major reason why Americans enjoy an abundant food supply is that the arable land at their disposal for food production is ______.
A．three times more the world average
B．three times as much the world average
C．three times the world average
D．the world average is three times
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