They spend as many hours as they have____ their EnglishA．improvingB．improvedC．im_刷题宝

题干

They spend as many hours as they have____ their English

A．improving

B．improved

C．improves

D．to improve

上一题下一题 0.65难度单选题更新时间:2018-07-07 10:16:51

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