单选题 9. The driver was at loss when word came that he was forbidden to drive for speeding.

【正确答案】 A

【答案解析】 应改为at a loss。本题考查固定搭配。at a loss意为“不知所措”，为固定搭配。
当因超速而被禁止驾驶的消息传来时，这位司机不知所措了。