.The poor woman with her two children in a street corner.A. was seen begB. were seen begC

问题补充：

.

The poor woman with her two children in a street corner.

A. was seen beg

B. were seen beg

C. were seen begging

D. was seen begging

答案：

A. was seen beg

B. were seen beg

C. were seen begging

(答案→)D. was seen begging

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