宏伟印刷厂:英语问题

来源:百度文库 编辑:中科新闻网 时间:2024/05/02 12:51:55
If you weigh 90 pounds, you ________ to the earth by a gravitational force of 90 pounds.
A. have pulled B. pull down C. are being pulled D. have been pulled
答案选D,为什么?这句话什么意思啊?
(7.21)

If you weigh 90 pounds, you ________ to the earth by a gravitational force of 90 pounds
意思是如果你重90磅,你已经受到90磅的地球引力。引力造成了体重90磅,对现在结果造成了影响,所以用现在完成时

If you weigh 90 pounds, you have been pulled to the earth by a gravitational force of 90 pounds.
如果您称90 磅, 您被拉扯了对地球由90 磅引力。
分析可得,是你“已经”“被”(地球)拉扯了对地球由90 磅引力,所以用现在完成时的被动语态形式,所以用have benn pulled。

是受到地球的重力吧 拉扯比较费劲