He often attends public lectures at the University of Leeds, chiefly ______ his listening comprehension ability.

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问题 He often attends public lectures at the University of Leeds, chiefly ______ his listening comprehension ability.

选项 A、so as to improve
B、for the purpose of
C、to improve
D、having improved

答案C

解析 动词不定式作目的状语,选C。
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