You can’t imagine the difficulty he ________ onto the cliff and saving the boy in trouble.
| A．had to climb |
| B．had climbed |
| C．had climbing |
| D．had on climbing |
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You can’t imagine the difficulty he ________ onto the cliff and saving the boy in trouble.
| A．had to climb |
| B．had climbed |
| C．had climbing |
| D．had on climbing |
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