问题描述：
4个英语短语的辨析.
catch up with sb.
keep up with sb.
get in touch with sb.
keep in touch with sb.
get into trouble
be in trouble
get married to sb.
be married to sb.
catch up with sb.
keep up with sb.
get in touch with sb.
keep in touch with sb.
get into trouble
be in trouble
get married to sb.
be married to sb.
问题解答：
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