I know one of the things I was unsure ab
题型:选择题
问题:
I know one of the things I was unsure about was _____ hard it would be to climb this mountain.
A.what
B.that
C.however
D.how
I know one of the things I was unsure about was _____ hard it would be to climb this mountain.
A.what
B.that
C.however
D.how