一You’ve made great progress in your survey, haven’t you?
——Yes，but some problems among the youngsters still remain——．
| A．settled | B．settling | C．to settle | D．to be settled |
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一You’ve made great progress in your survey, haven’t you?
——Yes，but some problems among the youngsters still remain——．
| A．settled | B．settling | C．to settle | D．to be settled |
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