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问题: 2

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解答:

Facial expression 主语
will be 谓语
an important aid 宾语
to the understanding of you lecture about ——to the audience among a small group 宾语补助语
you lecture about ——to the audience among a small group是 状语从句修饰the understanding of
to the audience among a small group 这是对象
you 主语
lecture about 谓语
缺少宾语
在状语从句中介词后不用that
所以用what