My keys were on the table when I left this morning and, now, they are not on the table. I am ..... a loss as to where my keys could have gone.

English as a Second Language Single question discussions
1

My keys were on the table when I left this morning and, now, they are not on the table. I am ..... a loss as to where my keys could have gone. (*) at (*) by (*) for (*) to

This is a companion discussion topic for the original entry at https://english.best/questions/17604,my-keys-were-on-the-table-when-i-left-this-morning-and-now-they-are-not-on-the-table-i-am-___-a-loss-as-to-where-my-keys-could-have-gone/