__________ without friends __________ the most difficult challenge for Chuck while living on the island.
| A．How did he survive; were | B．How he survived; were |
| C．How did he survive; was | D．How he survived; was |
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__________ without friends __________ the most difficult challenge for Chuck while living on the island.
| A．How did he survive; were | B．How he survived; were |
| C．How did he survive; was | D．How he survived; was |
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