题目内容：
The pressure ________ causes Americans to be energetic, but it also puts themunder a constant emotional strain.
A、
to compete
B、
competing
C、
to be competed
D、
having competed
参考答案：
选择题：The pressure ________ causes Americans to be energ
- 题目分类：西安科技大学-大学英语1.
- 题目类型：选择题
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under a constant emotional strain.
A、
to compete
B、
competing
C、
to be competed
D、
having competed