the, an, a; to try, trying, tryIf reading such______ book makes

the, an, a; to try, trying, try
If reading such______ book makes your head spin, I would recommend ______to read this one.
【正确答案】：a / trying
【题目解析】：Recommend后可跟不定式可跟动名词，recommend +宾语+不定式，recommend + -ing分词。