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

问题补充：

all the seats full, he had no choice but to stand up.

A. For

B. As

C. Though

D. With

答案：

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。