问题：
[多选题]According to Harmer, the reasons that students use mother tongue in class can be the following: ( ).
AThey prefer to use mother tongue.
BThey are incapable of talking about a given topic in target language.
CThe use of mother- tongue is a natural thing to do.
DIf teachers use the students’ language, students will feel comfortable to use mother tongue too.
答案解析：
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