It's ________ unusual thing for us to fi
题型:选择题
问题:
It's ________ unusual thing for us to find ________ UFO. [ ]
A. a; an
B. an; an
C. a; an
D. an; a
It's ________ unusual thing for us to find ________ UFO. [ ]
A. a; an
B. an; an
C. a; an
D. an; a