______ by the enemy,they had to surrender.A.Surrounded B.Surrounding C.To be surrounded D.Being surrounded 解释下为什么不能选D?难道不能是正在被包围

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______ by the enemy,they had to surrender.A.Surrounded B.Surrounding C.To be surrounded D.Being surrounded 解释下为什么不能选D?难道不能是正在被包围

______ by the enemy,they had to surrender.A.Surrounded B.Surrounding C.To be surrounded D.Being surrounded 解释下为什么不能选D?难道不能是正在被包围
______ by the enemy,they had to surrender.A.Surrounded B.Surrounding C.To be surrounded D.Being surrounded 解释下为什么不能选D?难道不能是正在被包围

______ by the enemy,they had to surrender.A.Surrounded B.Surrounding C.To be surrounded D.Being surrounded 解释下为什么不能选D?难道不能是正在被包围
D的意思是they被敌军包围 在开头就用Ing做状语的意思大多表示主动意义

过去式

是已经被包围了

后半句是had to,过去时态,前后时态要一致

这是说的一个已经过去的事件,主句是一般过去时,从句要配合使用

A是条件状语
D可以作宾语