问题
选择题
单项选择。
This is ______ "s" and that's______ "u". [ ]
A. a, a
B. a, an
C. an, a
D. an, an
答案
答案：C
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单项选择。
This is ______ "s" and that's______ "u". [ ]
A. a, a
B. a, an
C. an, a
D. an, an
答案：C