_________ knowing some Japanese, I am also fluent in Spanish.
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The farmers are very worried, because a lot of crops have ___________ for lack of rain.
As autumn _________ near, the cornfields showed signs of ripeness.
You have to _________ it that all the little leaks have been shut off.
按履约方式不同，期权可以分为
A. 美式期权
B. 欧式期权
C. 看涨期权
D. 看跌期权
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