Question

10. In order not to reveal their identity,they had to keep their marriage a secret         .

   A. just for once   B. for the moment

   C. at will   D. at a loss

Answer 1

10. B for the moment意为"目前，暂时"；just for once意为"仅此一次而已"；at will意为"任意地，随便地"；at a loss意为"茫然地"。