题目内容：
According to UCP 600, the term "middle"of a month in the letter of credit shall be construed as from the 11th to the 20th of the month and the term"first half"ofa month shall be construed as（ ）.A. from the 11 th to the 20th of the month
B. from the 1st to the 15'h of the month
C. from the 1st' to the 10th of the month
D. from the 11th to the 21th of the month
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答案解析：