What do you think has made her so upset? ____, I believe.A.She failed her examB.Failing her examC.To have failed her examD.Failed her exam

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What do you think has made her so upset? ____, I believe.A.She failed her examB.Failing her examC.To have failed her examD.Failed her exam

What do you think has made her so upset? ____, I believe.A.She failed her examB.Failing her examC.To have failed her examD.Failed her exam
What do you think has made her so upset? ____, I believe.
A.She failed her exam
B.Failing her exam
C.To have failed her exam
D.Failed her exam

What do you think has made her so upset? ____, I believe.A.She failed her examB.Failing her examC.To have failed her examD.Failed her exam
b,what 肯定是问一个名词的答案,因此是ing form

B
这里应该填一个名词性的短语,用来做主语。
还原回答的句子是:
Failing her exam has made her so upset,I believe