My roommate Tom has a great deal of trouble______(跟的上班上的其他同学).

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问题 My roommate Tom has a great deal of trouble______(跟的上班上的其他同学).

选项

答案keeping up with the rest of the class

解析 have trouble之后接动词的话要用该动词的动名词形式;“跟得上某人”用固定短语keep up with sb.。
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