题目内容
The poor old man with his two daughters ___ in the street.
| A．was seen to beg | B．were seen to beg | C．was seen begged | D．were seen begging |
A
句子主语是poor old man，所以谓语动词用单数，see动词用于被动语态中，宾补的不定式要还原to出来。
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