单选题：______ I'm well again, I can go on with my work. [ ]A. Ev..

I don't know _____ he gets along well with his lessons.A. how B. that C. whether D. what

— Did you remember to return the money you owed to Mary? — Yes, I gave it to her _____ I saw her.A. while B. once C. suddenlyD. the moment

Experts are trying to work out a solution to save the miners _____ its too late.A. before B. sinceC. unless D. when

— Anything else should we pay attention to if we go camping? — Nothing much.Just take a raincoat _____it rains.A. in case B. as if C. even if D. so that

I don't know why she's looking at me _____she knew me. I've never seen her before in my life.A. as B. although C. as if D. even if