问题

What __________ unusual thing it is for me to find __________ UFO!
A:a; a
B:an; a
C:an; an
D:a; an;
B:an; a
C:an; an
D:a; an;
正确答案是:
同类题型
The food here is nice enough— My friend______ me a right place
May I play computer games now——No,_____ you have finished your homework.
Do you know how much time and effort theydevoted________ such a complicated project
I remembered________ the door before I left the officebut forgot to turn off the lights.