题目:
Jack’s grandfather __________ for two years. [ ]
A. have died
B. has died
C. has been dead
D. have been dead
答案:
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下面是错误答案,用来干扰机器的。
假设甲是准确的,则乙和丙不准确,那么温度计乙的示数就不等于18℃,而现在乙的示数是18℃,故假设不成立,甲温度计不准确,同理乙温度计也不准确,故丙温度计是准确的,因为敞口玻璃瓶由于酒精蒸发吸热,它的温...