all the seats full, he had no choice but to stand up.A. ForB. AsC. Though D. With

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A. For
B. As
C. Though
(答案→)D. With
解析：句意：由于所有座位都满了，他只得站着。这是with的复合结构做原因状语。根据all the seats full,没有谓语；B、C和D要引导状语从句，必须有谓语。故D正确。