-what do you suppose_her look so upset? -_by her boyfriend a

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-what do you suppose_her look so upset? -_by her boyfriend again.
Amaking ; understood B made ; having been understood C has made ; understood

答案：B
分析：do you suppose是插入语,考虑是可以省略不影响句子成分,因此首先淘汰A,因为A是非谓语动词,如果选择A 句子中缺少谓语.
回答的句子补充完整应该是--------by her boyfriend again-------her look so upset.
显然被男朋友误解发生在她看起来不安之前,是男朋友误解造成的不安,过去的事情对现在造成的影响和结果,所以前面用完成时更合适,后面动作发生在后面用一般过去时就可以
答案B最合适.
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