问题
单项选择题
—When was the first man with A(H1N1) flu in mainland China known for sure
—______ May 11, 2009.
A. In
B. On
C. For
D. Since
答案
参考答案：B
解析： 考查介词。具体到某天介词应用on。故答案为B。
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—When was the first man with A(H1N1) flu in mainland China known for sure
—______ May 11, 2009.
A. In
B. On
C. For
D. Since
参考答案：B
解析： 考查介词。具体到某天介词应用on。故答案为B。