There is nothing ---but---down and wait for him to come backA to be done ,to sit B to do ,sit C done,to sit D to do,sit

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There is nothing ---but---down and wait for him to come back
A to be done ,to sit B to do ,sit
C done,to sit D to do,sit

B D都可以(因为他们一模一样).noting to do .A前面这个表达因该可以,但是to sit就有点问题.可以看到sit后面有个并列连接词and,而and 后的wait是原形的(可以看出sit和wait是两个平行的词汇).所以保持句子平衡,选sit

B

B

B和D