Many companies are trying their best to help business＿after a difficult period.
问题描述：
Many companies are trying their best to help business＿after a difficult period.
A.addB.calmC.scheduleD.recover
答
D
根据句意就可以了,“度过一段艰难的期间后,许多公司正在尽最大努力来复苏经济”
recover,“恢复”