问题

It is _______ unusual thing for us to find ________ UFO.
A:a; a
B:an; an
C:a; an
D:an; a;
B:an; an
C:a; an
D:an; a;
正确答案是:
同类题型
, but the idea of having towork more than ten hours a day without weekends discouraged me
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Johnny is a great dancer;he above the rest for his perfect performance.
. I ____ to the top of the tree, but I fell off it and hurt my leg.
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