The students find it hard______ their spoken English.A、improveB、having improved

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问题 The students find it hard______ their spoken English.

选项 A、improve
B、having improved
C、improving
D、to improve

答案 D

解析句意：学生发现很难提高英语口语。考查语法。动词不定式在本句作“it”的宾语补足语。 ’

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