问题
选择题
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
答案
答案：C
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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
答案：C