"Well done!" the teacher patted the shoulder of the student,_____ with a smile on his face.

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"Well done!" the teacher patted the shoulder of the student,_____ with a smile on his face.
"Well done!" the teacher patted the shoulder of the student,_____ with a smile on his face.

"Well done!" the teacher patted the shoulder of the student,_____ with a smile on his face.
这里分词作引导伴随状语,选B,
A的话,过去分词短语作定语时,通常放在被修饰的名词之后,它的作用相当于一个定语从句.要改为 the teacher,satisefied with a smile on his face,patted the shoulder of the student.等于是the teacher,who is satisefied with a smile on his face,patted the shoulder of the student.
C要改为,having been satisefied

可以不填,介词结构做壮语,如楼上所说;或者填“who”,引导主语从句。

这里不填就挺好的,介词结构做状语。