问题
选择题
It is really _________ unusual experience, and I'll never forget _________.[ ]
A. a; it
B. a; them
C. an; it
D. an; them
答案
答案：C
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It is really _________ unusual experience, and I'll never forget _________.[ ]
A. a; it
B. a; them
C. an; it
D. an; them
答案：C