[单选题]In （） drills, the students change a given structure in a way so that they are exposed to other similar structures, which also helps them have a deeper understanding of how the structures are formed and how they are used.

substitution

transformation

comprehension

communicative

正确答案：B

题目解析

本题考查语法教学。在语法练习中，机械操练有两种常用方式：替换操练(substitution drills)和转换操练(transformation drills)。题干中叙述内容属于转换操练的内容。故正确答案为：B。

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[单选题]In （ ） drills, the students change a given structure in a way so that they are exposed to other similar structures, which also helps them have a deeper understanding of how the structures are formed and how they are used.