问题描述：
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
说说为啥,明天老师给我检查饿.
c:done;to sit d:to do;sit
说说为啥,明天老师给我检查饿.
问题解答：
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