I try ________ the exam. I have worked hard.A.to worry aboutB.worry aboutC.not to worry aboutD.not worry about
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C解析精析：动词try可以用作及物动词，其后常跟动词不定式，意为“努力去做……”，try之后接doing sth.作宾语，表示“试着做某事”。如：Why not try drawing the picture again?“为何不试试再画一次呢？”try one's best是固定短语，意为“尽……最大努力”，其意义与do one's best相近。动词不定式的否定式是在不定式符号to之前加副词not来否定。如：The teacher told the children not to play football in the street.老师告诉孩子们不要在街上踢球。