80.The departure of the plane has been postponed, so we have nothing to do now but_____.
答案解析
解析：
在do nothing but, have nothing to do but等句型中。若 but 前面有实义动词 do的某和形式,则 but后面常接省略to的不定式;若but 前面没有实义动词do的某种形式,则不定式不能省略to。故选A
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