in a university in the USA Chinese students must have excellent speaking and writing abil

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。