Order came that all the army supply to the front before daybreak.
A. be sent
B. should send
C. were sent
D. should have sent
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(答案→)A. be sent
B. should send
C. were sent
D. should have sent
解析：考查同位语从句和虚拟语气。名词order后面的同位语从句要使用“should+动词原形：构成的虚拟语气，should可以省略。句意：命令传来，所有的供应物资都要在天亮之前被送到前线。故A正确。