单选题
His father has been working hard for many years to support him at university so he did not want to ______.
【正确答案】
C
【答案解析】let him out意为“让他出去”；let him in意为“让他进来”；let him down意为“令他失望”；let him away意为“让他走开”。根据空格前面的working hard to support him(拼命工作供他上大学)可知，应该选用let him down。