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问题: 求高手解释一下这道英语题,最好有详细一些,谢谢

The pressure _____ causes Americans to be energetic ,but it also puts them under a constant emotional strain.
A.to compete B.to be competed
C.having competed D.competing

解答:

首先compete肯定是没有被动形式的,D的话显然是语法错误.类似这种形式是常见用法记住就行了.