2. 外语
  3. He always has great trouble (understand)______what the teacher says in class.

He always has great trouble (understand)______what the teacher says in class.

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问题 He always has great trouble (understand)______what the teacher says in class.
选项
答案understanding
解析 have trouble(in)doing sth. 为固定用法，表示“做…有困难”。
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