Question

【题目】Our duty in the school is _________ trying and learn by heart.

A. to keepB. keepingC. keptD. keep

Answer 1

【答案】A

【解析】

句意：我们在学校的职责是不断地努力学习。A. to keep动词不定式；B. keeping动名词/现在分词；C. kept过去式/过去分词； D. keep动词原形。根据句意可知，此空在句中作表语，故用动词不定式，符合题意，此空故填to keep，故选A。