some of the sudents have trouble (make)complete sentences.为什么the best way to improve your english is (study) with a group.为什么?

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some of the sudents have trouble (make)complete sentences.为什么the best way to improve your english is (study) with a group.为什么?
some of the sudents have trouble (make)complete sentences.为什么
the best way to improve your english is (study) with a group.为什么?

some of the sudents have trouble (make)complete sentences.为什么the best way to improve your english is (study) with a group.为什么?
第一空填making,have trouble doing sth.是固定搭配,解释为做某事有困难.
第二空填to study,这里不定时作表语,此句为系表结构,is是系动词,to study with a group是表语.