答案不是having recoverd ,原因如下:
(如下从字典里搬来的)
1. 重新获得;重新找到
Jane recovered her lost wallet.
简寻回了丢失的钱包。
2. 恢复;使恢复原状
Jennie made a great effort to recover herself.
珍妮努力使自己镇定下来。
She has recovered her health.
她已恢复了健康。
3. 挽回,弥补
It's hard to recover lost time.
弥补失去的时间并不容易。
4. 【律】取得(损害赔偿);取得...的所有权
5. (填海)造(地),围垦[(+from)]
vi.
1. 恢复健康;恢复原状;恢复[(+from)]
It took a long time for him to recover from a bad cold.
他患重感冒,很长时间才康复。
I think she will recover.
我想她会痊愈的。
以上可以看出,recover oneself 是指某人身体恢复,
如果要说某人康复,可以用主动,亦可用被动。
主动表示方法:
He has recovered himself.
被动表示方法:
He has being recovered.
上句中,Once后面如果接的是个完整的句子,应该为:
Once he had been recovered ,....
省略掉之后是:Once having been recovered,.....
答案是B,Once (he) recovered (himself),...
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