I am anxious because I am uncertain ________ next.
I am anxious because I am uncertain ________ next.
A.about doing what
B.to do what
C.about what to do
D.about how to do
答案及解析： C
I am anxious because I am uncertain ________ next.
A.about doing what
B.to do what
C.about what to do
D.about how to do
答案及解析： C