“于生效之日起，此协议有效期为三年。”的英文是（ ）
A、This agreement shall become effective as of the effective date and shall remain in effect for three years.
B、This agreement will become effective as of the effective date and will remain in effect for three years.
C、This agreement will come into effect as of the effective date and will remain in effect for three years.
D、This agreement shall become effective as of the effective date and will remain in effect for three years.
【正确答案】：A
【题目解析】：本题考查shall在法律领域的含义特点。在法律条文、规章制度中，常用“shall”表示命令，这主要用于第三人称。此时，shall在意思上接近must，A选项符合题意。
