Question

And if he could not_______(偿还)his debt,they would nail him to the wall.（根据汉语意思填空）

Answer

pay off

【解析】

考查动词。句意：如果他还不了债，他们就会把他钉在墙上。根据中文提示“偿还”可知pay off符合题意，由could not可知要用动词原形。故填pay off。