问题补充:
in a university in the USA, Chinese students must have excellent speaking and writing abilities in English.
A. Educate
B. Being educated
C. To be educated
D. Having educated
答案:
A. Educate
B. Being educated
(答案→)C. To be educated
D. Having educated
解析:句意:中国学生为了能在美国上大学,他们必须有极好的英语的读写的能力。这里整个句子的主语是Chinese students,它与educate之间是被动关系,用动词不定式表目的,其他的几种形式不能表示目的,故选C。