There was nothing they could do.A. but wait　　　B. except waitingC. only to wait　D. unless t

问题补充：

There was nothing they could do.

A. but wait

B. except waiting

C. only to wait

D. unless they waited

答案：

(答案→)A. but wait

B. except waiting

C. only to wait

D. unless they waited

解析：考查固定短语be nothing but。当but做除了的意思讲的时候，要遵循“有do无to，无do加to”的原则， but前出现了do,but后的to就要省略。故选A。