改错Tom and(A)Mary took their(B) shoes in case of (C)they decided to go dancing

改错Tom and(A)Mary took their(B) shoes in case of (C)they decided to go dancing

题目
改错Tom and(A)Mary took their(B) shoes in case of (C)they decided to go dancing
Tom and(A)Mary took their(B) shoes in case of (C)they decided to go dancing
答案
C 错误.
in case of 改成 in case.
in case of是为介词短语,其后不能加状语从句;
in case既可以单独使用,也可引导状语从句.
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