第28题: [单项选择]Delkar Trading ultimately chose ______ back to their Legacy software system over maintaining the current one at such high expense. A. conversion B. convert C. convertible D. convertibly 参考答案:A 答案解析:本题选项中的词性各不相同,是一道考查词性的题目。我们按照前面所讲的解题思路,观察空格前后,可以看到前面有动词“chose”。因为“chose”是及物动词,所以空格处应该填入宾语(=名词)。显然,是(A