单选题 Many companies in smaller cities are offering such great professional opportunities that some graduates have a hard time ______ them down.

【正确答案】 A

【答案解析】[解析] 本题考查动词短语的固定搭配。have a hard time doing sth. 表示做某事很困难，后面要用动词的-ing形式，故选A。类似的有have difficulty (in) doing sth. 等。