You can’t imagine the difficulty he _____ onto the cliff and saving the boy in trouble.
A．had to climbB．had climbed C．had climbingD．had on climbing
C
考查定語(yǔ)從句和非謂語(yǔ)動(dòng)詞。句意：你不能想象出他爬上懸崖就這個(gè)陷入困境的 男孩的困難。he had做后置定語(yǔ)修飾difficulty，現(xiàn)在分詞作伴隨狀語(yǔ)表示正在進(jìn)行的伴隨性動(dòng)作，和he是邏輯上的主謂關(guān)系。故選C。
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