When Mary was young, she ________
| When Mary was young, she ________ able to dance very well. |
| [ ] |
| A. could be B. can be C. was D. could |
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你能帮帮他们吗
| When Mary was young, she ________ able to dance very well. |
| [ ] |
| A. could be B. can be C. was D. could |
你能帮帮他们吗