问题
选择题
—What's this?
—___________. [ ]
A. It's an H
B. It's a H
C. It's a F
D. It's an B
答案
答案：A
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—What's this?
—___________. [ ]
A. It's an H
B. It's a H
C. It's a F
D. It's an B
答案：A