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He ordered that the secret message________to the headquarters at once.
A、is sent
B、to be sent
C、be sent
D、being sent
【正确答案】：C
【题目解析】：该题考查虚拟语气。order接宾语从句谓语动词用should+动词原形，should通常省略。本题C就是省略了should的形式。